It's a really bad idea to post your email address - it's an invitation to spam - and it's a REALLY BAD idea to post your credit card number, and I've asked the Hosts to remove them. This is a public forum: never post personal information.
The message you refer to may be a scam. Check your iTunes account and your credit card to make sure the money actually has been withdraw.
If the app has a subscription you need to cancel it: View, change, or cancel your subscriptions - Apple Support
As to a refund, strictly speaking all purchases are final (after all, you can't very well return them): please see this page for information on requesting a refund: Request a refund for an App Store or iTunes Store purchase - Apple Support
However Apple have been known to be sympathetic in cases of actual error, so it's possible that they may allow you a refund as a one-off concession: but please be aware that they are under no obligation to do so: go to iTunes Store - Contact Us - Apple Support
Alternatively go to the page suggested in the Help page linked to above: Report a Problem