Hello crosker,
We understand you're having difficulty canceling your subscription to iHeartRadio. We're happy to help you out with this.
Canceling your subscription will vary depending on where you originally signed up for it. If you signed up through iTunes or the App Store, you should be able to cancel that subscription using the steps here: See or cancel your subscriptions.
If you signed up someplace else, you can find steps on how to cancel on the iHeartRadio website here: iHeart Radio - How do I cancel my subscription?.
Thanks for using Apple Support Communities.
Take care.