CHARGING AFTER CONTRACT EXPIRED - CANCELLATION HELL

My Contract expired and reached end of term November 2020. I phone on 3 separate occasions in October to make sure the contract is cancelled and does not renew. I phoned on the 5th the 10th and the 20th of October to make double sure everything is fine and cancelled and I was assured the contract will end on the 19th of November and that I will NOT be debited again. I even received 2 calls from their retentions department and I said very clearly NO I WANT TO CANCEL. Today is the 2nd of December and almost R900 was debited from my account, the account I requested NOT be renewed. It wasn't like it was mid term or something the contract was end of period and I EXPLICITLY REQUESTED ON 3 DIFFERENT OCCASIONS THAT THE CONTRACT BE CANCELLED. After 4 hours on the phone I have managed to get the contract now finally cancelled after my Attorney got involved. What an absolute horrible nightmare - stay as far away from Cell C as humanly possible!