Telkom still debiting me 5 months after service cancelled

I don’t know what else to do.

Telkom are still debiting me 5 months after my Telkom line was cancelled, debiting me for an internet ADSL package when I don’t even have a line with them.

I have visited more than a dozen times, asked for Call back’s which don’t get returned anymore, and they are still going to debit me again on 3 April 2018.

When I suggested to Telkom I would do a stop payment at the bank, they cautioned me, that it will affect my credit record, as the Credit Bureau’s have no record of whether the debit was an unauthorised debit or not.

Please help, I am due a lot of credits as they have been debiting me from December 2017 until April 2018, and still are debiting me, and I cannot get them to stop.

Please advise whether I am to open up a police case of theft, as they are not authorised to debit my cheque account, as I have got signed Cancellation of service letters, which I have sent to them four times, including from their own office to another Telkom office.

********** and ********** are the phone lines in question.