re: Amazon Prime Account

You might want to go to haveibeenpwned and check if your email and password have been leaked somewhere. If they were able to get into your email and you use the same password for your Amazon acct, they could have logged you out and changed your account details. The account might still be there but it's now in their hands.

As someone earlier said you probably should check credit cards, bank accounts etc. anything that's associated with your Amazon acct. and anything that's associated with your email.

It could be some weird thing on Amazon's end but it sounds a little like someone has gained access to your account and possibly your email. If that's the case set up 2FA on everything you can. Start locking things down now before it's too late.