MTN OVER CHARGING ME

I am very disappointed in MTN. I bought a Huawei G6 phone in December. starting January they have been charging me BIS which I don't know how do you charge a person a BIS on Huawei??? really are we the milk ***s where they just add whatever they want to charge despite what the customer bought? I have been calling for refund since last month. I want my money back.<br> <br> Second issue. I have put a clause on my contract that when I reach a limit they must soft lock it. But no MTN decide they are not going to do it I have phoned in 6 times and even went to the branch in centurion. Still today is not done. now they charge my more money. please make sure you activate this and stop charging me funds that I said they must be stopped. I got a bill for R1880 last month which was not suppose to happen as I put a clause to soft lock this.<br> <br> your stuff when I call their so rude hence they don't do what their hired to do. PLEASE FIX THIS BEFORE I TAKE IT FUTHER.