TERRIBLE CUSTOMER SERVICE FROM MTN!

i have contacted mtn numerous times regarding my contract with them, ever since I have taken this contract I have gotten nothing more but headaches and I am required to pay them for a contract that has not been working and nor has it been working. My sim card was apparently damaged and had to have it replaced now that it is replaced it still does not work and having phoned customer care I have just gotten the run around!I am sick of MTN as when you are seeking a contract they are only too helpful but when you have problems they give you the run around as to which branch you can and should go to. I am so sick and tired of this terrible horrid service that I have been receiving