Where are my saved messages and how do i delete them

Try to contact fb help and drop message there. FB will help you recovering your account.

To delete a message:

1. Click Messages on the left side of your homepage.
2. Open the conversation you want to delete a message from.
3. From the Actions menu, select Delete Messages...
4. Use the checkboxes to select the messages you want to delete.
5. Click Delete.

How do I delete messages or a conversation? ' Facebook ...

https://www.facebook.com/help/192631610782421 Facebook
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WhatsApp FAQ - How do I delete messages or chats?

Settings/Mail, Contacts, Calendars then tap the account you're having trouble with.

Assuming you're using an IMAP account, tap the account user ID on the first line. Scroll to the bottom and tap Advanced.

Tap Deleted Mailbox. In the ON THE SERVER section, tap Trash (making the Trash mailbox on the server your "Trash" location). Back up to Advanced and make sure MOVE DISCARDED MESSAGES INTO: is set to Deleted Mailbox.

You may want to do the same thing for your Sent Mailbox (using Sent on the server for sent messages - so they're retrievable from your desktop).

This fix may result in all the old deleted messages on the iPad being moved to the server and then showing up again in your deleted messages on your desktop. The Mail app will eventually delete them as it does any deleted messages according to its settings.

First manually delete all imessages and messages on your phone. This wil not get back all the space but it ensures you have no messages and the success rate is much higher.

Swipe left over the person's name/subject preview in the left panel, and choose delete.

Alternatively, to delete individual messages tap and hold the message, select the messages you want to delete and hit the "trash can" symbol :)

General > Spotlight Search >
then un-click iMessage
so that way it won't ever show up again.

1. If you only don't want deleted messages to show up in a search then turn off Messages in Spotlight Search.

2. If you want the messages physically removed, a quick Google search found that syncing with iTunes removes deleted messages (I haven't tried this).

3. Don't forget messages are backed up in iTunes so that also needs to be considered.

4. iCloud backups ???

5. The person you're messaging with may have copies

6. And there are probably more...

Press install

If you backed up your messages to iTunes, you can retrieve them from iTunes. Just connect your iPad to the computer, and then sync the lastest data.
If you have no backup, you also can recover the deleted files on iPad, just recover messages in your iPad. And there is a step-by-step tutorial may help you recover.
Good luck to you.