HOW THE FXXK DO YOU CANCEL A MTN CONTRACT

The worst service ever!!!!!!! I am on a contract that expired in Jan 2021 in my personal name. My intention was to open an a new contract worth 3 times what my old contract was worth in my businesses name. I was told by a very unhelpful assistant at the North Cape Store in Kimberley that I needed to phone 135 to cancel my contract and change it to prepaid. I have contacted 135, 7 times today only to be sucessfully be transferred to the cancellation/retention department twice and then having spent over 2 hours waiting and still no one picked up. THERE IS ALSO NO ALTERNATIVE WAY TO CANCEL MY CONTRACT. This is completely rediculous and not in accorance with the consumer protection act. IF I EVER manage to get my contract cancelled, MTN will never see my business again.