Contract cancellation

I feel very disappointed by Telkom cancellations department, I have been trying to cancel my contract since the end of October 2020 as my contract was coming to an end in November, and did according to their 30 day notice policy when cancelling the contract, I called in manier time to follow up but nothing has been done the contract is still active, pity I always forget to take call ref numbers, but the ref number for cancelation is ***9, the last time I spoke to a agent they said they will do an immediate cancellation in 24hrs and yet It's been a week the contract I still active, can this be done with immediate effect as promised.