BT notifier subscriptionat 99.99 for one week

See View, change, or cancel your subscriptions - Apple Support. Active subscriptions should show with a renewal date.

See Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support. If you used a link in the email to cancel the subscription, and it wasn't a subscription you were aware of, then see If you think your Apple ID has been compromised - Apple Support, change your Apple ID password, and if possible turn on Two-factor authentication for Apple ID - Apple Support.

tt2

Have you been able to cancel the renewal? Is this an app you've purchased/installed? Was the email a scam? If you used links or contact information within you may have given your details to fraudsters.

tt2

Also, go to Settings>iTunes and App Store> (Sign in if prompted)>Scroll down to Purchases and then see if you have any purchases there. If not then go back 1 page and then check subscriptions. In subscriptions check to see if you have anything that relates to this notification.

Was this an email? If so then go to the email and at the top of the email in the “From” field, tap on it. If it says ”From Apple“, tap on Apple and then see what the actual email address is. If it is truly from Apple then it will be from something like “iTunes.apple.com or iCloud.apple.com or apple.com or email.apple.com. If it does not end in apple.com, then it is most likely not from Apple.

Again... if you call Apple support, then call the number above 1-800-MyApple and ask to speak with a senior advisor as they will be best equipped to handle a call about a potentially unknown purchase/compromised account.

This is a user to user support forum. No one here see your account. I suspect the email you received was a fraudulent phishing exercise. The message could have said anything. The aim would be to get you to click a link to a fake version of Apple's website where you are tricked into giving your Apple ID credentials that the scammers may then abuse. Have you looked at all of the resources I have linked to yet? You may need to act quickly.

tt2

There is nothing that can be done for you here or by me. You are not speaking to Apple Support in this discussion thread. This is for you to get help from more advanced users.

My directions above are clear and will help you resolve your issue.

You said:

The app I did not buy but it said in application purchase.

If you did not buy the app, but you did get an email, then the links and contact information in that email are highly suspect. If it turns out the email is from Apple and your account has been charged then potentially your iTunes account has been hacked. Either way I urge you to consider your initial response to the email in case you have fallen victim to fraud.

You also wrote:

Who is policing the application and application purchases and how much they are charging! Is 99.99 a week is worth for Bluetooth connectivity between two devices? Who is the fraudster?

That is a separate issue. Apple do perform some policing of what goes into the app store but there are some legitimate items with quite expensive in-app purchases. I wouldn't pay for LinkedIn for example, but some people do. You should be able to report a concern over a particular app using a number of feedback routes. I can find between 10 and 12 apps that match a search for BT Notifier, so I can't tell which one in particular you are referring to.

tt2

Make sure you contact 1-800-MyApple when calling.