Pathetic service

I had a contract that ended on the 16.11.23 and i called 135 to place notice to cancel a mnth before the end date, they have not cancelled the contract, i sent emails from *** and no feedback received, i had to go into a mtn store on thursday the 14.12.23 to cancel and they said that december includes that bill which is wrong if i am debited i will be taking mtn to the consumer onbudsman. The retentions department also comfirmed that it was cancelled however it was not, johanne nair ***