Unauthorized debits

Very very discussed is telkoms bad service, Ive been trying to stop unauthorized debits on my account by telkom since bfor july last year. After three attempts of canceling my contract and being assured tht it will be by ur agents I have been debited a few times after. Today I noticed that another debit was made on 25th January which I reversed and called the contact centre, I was told tht the amount was for the use of the sim and data in june, however my first requist for cancelation was in may and I dd not use the sim or data thereafter so dont get y I am being billed for something I wasnt using if the contract was not cancelled immediately after requesting for cancelation how is it my problem as customer that u are not operating efficiently. I will include my reference number for escalation and expect someone with some sense to assist me and resolve this matter.