Hello, Mike -
You will need to contact TuneIn directly.
Go to this TuneIn web page and choose Listener:
http://www.fixya.com/answer/answerpageslideview.aspx?thid=26859170&ctg=461
That will bring you to a page where you can fill out a form to send an email asking how to cancel your subscription.
I also found information on cancelling / unsubscribing here:
https://discussions.apple.com/thread/7365414?start=0&tstart=0
Scroll down to the bottom of that page and read what robynphd wrote.
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