I want to cancel my Somnapure trial, It is under 18 days

hi Denise.
To end your Amazon Prime membership:

1. Go to Manage Prime Membership .
2. Do one of the following: To cancel a paid Amazon Prime membership, click End membership. Note: Paid members who haven't used their benefits are eligible for a full refund.

End Your Amazon Prime Membership - Amazon.com

https://www.amazon.com/gp/aw/help/id=201118010
You can end your Amazon Prime membership, or cancel your free trial to ensure it doesn't convert to a full Amazon Prime membership, in the Settings section of Your Account. Manage Your Prime Membership.

Depending on whether you have a paid Amazon Prime membership or are on a free trial, do one of the following:

• To cancel a paid membership, click End membership, which is the second option on the left-hand side of the page. Note: Paid members who haven't used their Amazon Prime benefits, including One Day Delivery, Prime Video, Prime Music and the Kindle Owners' Lending Library will be eligible for a full refund. Paid members who have used their Amazon Prime benefits may be eligible for a partial refund based on use.
  
• To cancel a free trial, click Do not continue, which is the second option on the left-hand side of the page.Note: If you select Do not continue for your free trial, you'll receive benefits until your free trial period ends. Then your membership will cancel, and your card won't be charged. If you decide later in the free trial to continue your membership, you can change this setting back by clicking Continue membership. You can opt out at any time during the free trial period.

You can also choose to set a renewal reminder by selecting Remind me Later in "Do not continue", which is accessible in Your Account, under "Manage Prime membership". (This reminder option won't be available if your renewal date is within the next three days.)
if you need more info on this go to this link.

Cancel prime membership Google Search

why do you expect fixya site to have anything to do with amazon prime
it is for you to contact amazon prime direct yourself and do the cancellation
it is for you to contact your bank and to stop direct debit payments to amazon

You can end your Amazon Prime membership, or cancel your free trial to ensure it doesn't convert to a full Amazon Prime membership, in the Settings section of Your Account. To end your Amazon Prime membership or cancel your free trial: Go to Manage Your Prime Membership. Depending on whether you have a paid Amazon Prime membership or are on a free trial, do one of the following:To cancel a paid membership, click End membership, which is the second option on the left-hand side of the page. Note: Paid members who haven't used their Amazon Prime benefits, including One Day Delivery, Prime Video, Prime Music and the Kindle Owners' Lending Library will be eligible for a full refund. Paid members who have used their Amazon Prime benefits may be eligible for a partial refund based on use. To cancel a free trial, click Do not continue, which is the second option on the left-hand side of the page. Note: If you select Do not continue for your free trial, you'll receive benefits until your free trial period ends. Then your membership will cancel, and your card won't be charged. If you decide later in the free trial to continue your membership, you can change this setting back by clickingContinue membership. You can opt out at any time during the free trial period. You can also choose to set a renewal reminder by selecting Remind me Later in "Do not continue", which is accessible in Your Account, under "Manage Prime membership". (This reminder option won't be available if your renewal date is within the next three days.)

yes they will, you need to cancel the trial. no free trial of anything is worth giving your bank details. the small print will say something like " if you dont cancel within 7 days we will take £££ by direct debit every *** " why would they need your bank details for a "FREE" trial ?.. thats because most people forget or dont know how to cancel so they get at least one payment out of your "free" trial . if they do take a payment and its a monthly subscription you will still have to cancel the free trial because if you only cancel the direct debit they can still charge you because they are supplying a service. get in touch with them straight away. ( hopefully you havent signed up to 12 months contract starting when free trial stops )

Cancel Your Amazon Prime Membership You can cancel a paid or free Amazon Prime membership in the Settings section ofYour Account.
Manage Your Prime Membership.

Do one of the following:

• To cancel a paid membership, click End membership, which is the second option on the left-hand side of the page. Note: Paid members who haven't used their Amazon Prime benefits, including the Kindle Owners' Lending Library, One Day Delivery and Prime Instant Video, will be eligible for a full refund.
  
• To cancel a free trial, click Do not continue, which is the second option on the left-hand side of the page. Note: If you have a free trial you'll receive benefits until your free trial period ends. Then your membership will cancel, and your card won't be charged. If you decide later in the free trial to continue your membership, you can change this setting back by clicking Continue membership. You can opt out at any time during the free trial period.
  

You can also choose to set a renewal reminder by selecting Remind me Later in "Do not continue", which is accessible in Your Account, under "Manage Prime membership". (This reminder option won't be available if your renewal date is within the next three days.)

Cancel Your Amazon Prime Membership You can cancel a paid or free Amazon Prime membership in the Settings section ofYour Account.
Manage Your Prime Membership.

Do one of the following:

• To cancel a paid membership, click End membership, which is the second option on the left-hand side of the page. Note: Paid members who haven't used their Amazon Prime benefits, including the Kindle Owners' Lending Library, One Day Delivery and Prime Instant Video, will be eligible for a full refund.
  
• To cancel a free trial, click Do not continue, which is the second option on the left-hand side of the page. Note: If you have a free trial you'll receive benefits until your free trial period ends. Then your membership will cancel, and your card won't be charged. If you decide later in the free trial to continue your membership, you can change this setting back by clicking Continue membership. You can opt out at any time during the free trial period.
  

You can also choose to set a renewal reminder by selecting Remind me Later in "Do not continue", which is accessible in Your Account, under "Manage Prime membership". (This reminder option won't be available if your renewal date is within the next three days.)

To cancel a free trial membership, go to the Account Settings page once you have signed in to your account. Under the Subscriptions section, click the link to show a list of your active subscriptions. Select the 7-day free trial membership and complete the cancellation form to stop future membership payments. If you wish to keep your free trial but would like to cancel a different subscription, please follow the above steps and select the appropriate subscription you would like to cancel. [Emphasis added]

From the PeopleSmart website

Most services that are offered by trial can be cancelled, but only in a limited amount of time before you get charged, if you entered your credit card information. If the 30 day trial is ending soon, it's best that you cancel as soon as possible. If you can not find a link to cancel your membership on the website where you have the trial, you can also e-mail tech support, and mention that you need help cancelling your membership.