Poor service and continued deductions after contract cancellation

After receiving poor customer service at the Brooklyn Mall branch more than once, I moved to another provider. This includes not receiving statements after repeated requests, not being able to update my email address after it was changed to an incorrect email address, staff closing the store in working hours and managers treating customers poorly. Unfortunately, it seems to be impossible to get a contract cancelled. After following the process to cancel my contract, debit orders are still being deducted. Contacting customer service is impossible. The calls have to be transferred to the contract department from the main customer care number and the direct number is "experiencing problems". The contract department either drops the call after answering and not speaking for a few minutes or they keep you on the line for 40+ minutes with no answer.