Disgusting MTN

I am so damn disgusted with MTN. I have had my cellphone number since I was old enough to have a phone. I cancel my contract and start a port with another service provider. When the port takes more than 24 hours I am told MTN haven't released my number. I phone MTN and after being assured by retentions a week before my contract is canceled and I am on prepaid I now get told that it's still on contract. I will never ever use MTN or refer them to anyone. Just when I thought Vodacom were the worst I was proven wrong.