I opened an Apple credit card and used it for a few purchases. I needed to pay the bill Of {$87.00} and contacted them to make a payment over the phone by check. I paid the balance on XX/XX/19 over the phone by check. 
I received a letter demanding payment again for the same bill, this time with an added amount of interest, {$2.00}. I contacted them again by phone and agreed to send a paper check via U.S. Postal service, which I did for {$87.00} on XX/XX/19 ( # XXXX ). 
I received another bill via USPS demanding payment of interest on top of Interest, the new amount is {$2.00}. I have tried to resolve this matter via phone to no avail. 
I do not owe this money. I appreciate any assistance you may provide. This is a Predatory tactic by a large bank which has engaged in unfair and deceptive practices.