Unauthorized debits / cancelled contract - Disgusting service from MWEB

I have been a customer of Mweb for years. Mid last year, I changed service providers and notified mweb. For the last 7 to 8 months, they still attempt to debit my account even though there is NO authorisation. I called the customer services and now I am told that there has been no record of cancelation request. When I did ask for an immediate cancelation, they refuse to cancel until "outstanding subscriptions" are settled in full. I have NOT used there services since moving to an alternate provider. I have been reversing payments at the bank, as they debit my account WITHOUT authority and for odd amounts. I would like this STOPPED immediately. It has been muchy longer that my contractual period of 2 years, hence I do not understand why they CANNOT cancel the contract. I have NOT used there data or services since taking on a new contract with a competitor, and there should be records that mweb has to verify that the data services was NOT used for the last 7/8 months. I have not received any emails or calls from mweb, however they stopped debiting for a few months and now have started again as and when they feel like. I await urgent response from MWEB. I called with refr number ***0.