Worst service ever

I am currently on the line holding for 20 minutes waiting for the manager in the retentions department and I am speaking to Carmen Maistry who first speaks to her colleagues before attending to me the customer and when I told her I could hear her speak to her friend before she attended to me she still tried to dispute it, anyway when I tried to cancel my cellphone contract that I had already paid an extra months subscription I was told that I need to give a 30 day notice and I keep on phoning through to cancel, I called through in the beginning of February and they said I should call back once I've made my last payment. On the 24th of February I made my last payment. After holding on the line for 11 minutes I spoke to Carmen's team leader Mumtaz Ismael who got approval to cancel my contract after I have told her numerous times that I kept on calling through to have this contract canceled. After they processed the cancelation, they advised that I should call through to billing to find out what my prorated amount would be for me to make payment and again another harrowing experience from MTN. How on earth could I have ever gone into an agreement with MTN they are a bunch of ****** doing there best to loot money. I'm now waiting for assistance from a consultant to assist my with my billing and I haven't even spoken to anyone and already I'm on the line for 11 minutes