Contract ended and canceled but Telkom still debiting me

Can someone please clarify as to why I keep getting statements from Telkom where as I canceled my contract with them in February?

I used to pay R59 for a 5gig data that was month to month but all of a sudden I was getting statements from them saying I should pay R202 of which they claimed debit order bounced in January 2022, I sent through to them proof of payment that the debit order went through from my side as the bank statement is showing it, in February I was supposed to pay the last R59 as I had canceled the contract beginning of February after receiving data but came March they still went to my account debiting me R202, I let it be because I had been so SO EXHAUSTED calling telkom explaining the same thing over and over again, then April they still went to my account debiting me yet ANOTHER R202 that I don't know what for and AGAIN I let it be cause honestly I'm so TIRED of calling, explaining, sending emails with prof payments and all, now in May they sent me YET another statement saying I must pay R404 for May, I still don't know what I am paying for because the contract was canceled in February but it seems I owe Telkom for the rest of my life now and each month the amount I supposedly owe goes higher and higher.

What does one need to do to get rid of Telkom after canceling the contract?