Who do I contact if my bank says a charge tried posting to my bank acct for $159.36 but there is nothing in my receipt history

Click on the link to read what to do "If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement" --> https://support.apple.com/HT201382 - If you are a Family Sharing organizer, purchases or subscriptions made by another family member may be charged to your card but will not appear under the your purchase history or subscriptions. Ask family members about those or check your receipts.

Contact iTunes Store Support and explain your problem, filling out and sending them this form:

iTunes Store – Contact Us – Apple Support

Regards

Giulio

not a hack so much as an outright scam

see this link:

https://support.apple.com/en-us/HT201382

does your bill show

APL*ITUNES or something similar?

Are you sure it's your bank and not a cold call?

to see your purchase history from Apple see this link:

https://support.apple.com/en-us/HT204088

It may be credit card fraud in which case that is something your financial institution needs to handle (also mentioned in the document I linked which I hope you read since it covers a number of reasons explaining unrecognized Apple charges, but I know people really prefer to get individual listings of things in posts here than have to read an official Apple Support document).

One thing is, if it is a valid Apple charge to your account and you blocked payment, you'll know about it from Apple when they disable your account for non-payment. If it isn't and somebody is trying card fraud for their account, then they will hear about it. :-)