Telkom Mobile contract cancelation

Debit orders have been going off on my account for a contract that expired a year ago they decreased the data from 10gig to 500mb but still debit the same amount. After canceling on the mobile app it just showed query logged. Went to the store to cancel, the agent cancelled and told me that no debit will go off that month, It still went of, I queried the debit order with my bank who then reversed it. Telkom then sends me a bill of 240rand for my 40rand debit order that was reversed. A 40rand that there is no contract for, that they arent entitled to. Telkom is the worst ever