I recieved an email about an unauthorized charge to my Apple ID account. How do I follow up on this?

Its very likely a scam. DO NOT respond to it in any way. You can check your purchases: go to https://reportaproblem.apple.com/?s=6 and select 'Request a refund' from the menu in the page. This will show you a list of your purchases. You'll probably find there is nothing unauthorised there. You could also check the Apple Store for hardware purchases.

I keep getting charged $64.85 from apple luckily it declines it but it’s not showing me where it’s from or what device. I haven’t added my card in anything so idk why it’s doing that