Telkom refuses to cancel contract and continues to *******ly deduct from my account

So... my problems began with Telkom when I had asked for a cancellation of my contract on financial grounds and terrible service on November 20, 2019 (reference number *** : ***9). Telkom refuses to cancel the contract and keeps sending me messages about suspension of the said line. After numerous back and forth time consuming phone calls, on March 15, 2020, I had to pay Telkom a penalty fee of R1150 (with a new case number 32****20) .Yet Telkom keeps making random deductions on my bank account. Can Telkom just stop deducting from my bank account as I have no contract and do not owe them.