Telkom keeps debiting my account

My name is Dorothy Mojela, i have been on a Telkom contract for 2 years which lapsed.when my contract ended i asked if i can take a tablet and telkom said i should re-apply for the contract because it falls under data. I refused and left the contract running for R281 pm suddenly i was billed R345 and when i called was told they add on for you without telling you and you should call to cancel. I didnt like the service any longer and went cancel my contract in the middle of the month..they deleted my number on the 7th of the next month without warning and that was that..first i was told they will debit R40 for the 7 days then they started debiting R281 again..i havent used the number *** since they stopped it but i'm billed. This is the worst service ever