WORST SERVICE EVER FROM MTN CONSULTANTS

I would like to cancel my current contract as I have received the worst service from MTN at Liberty. I don't have a phone that i am paying for currently due to incompetency from MTN consultants. I submitted my phone for warranty assessment which was approved a week ago, at first i was told the phone is no longer available and I agreed to take another different phone but almost on the same price range and later to be told that my package is not on that particular phone and was told again that there is an MTN shop in rose bank which as my phone and that it will be fetched. I waited again another day to be told that it was a wrong phone and now I'm being told to wait until they get the phone. i am not willing to wait because i was treated like a fool by those women consultant with stinking attitude and no problem solving skills and no sense of urgency for a customer. it is not my fault that i was give two bad phones that didn't last for even 3 months but kept breaking. i want a response today as i have had it with those useless women consultant at the MTN shop and especially Mpho whom this had nothing to do with her because she wasn't even the one who assisted me.