Cancelation of a bogus contract

MTN is the worst ever, when it comes to canceling a mere R150 sim deal contract, you end up being charged R800, and they give you bills for phone calls you never made. Mind you this is after you have called the customer care line to no avail and we had to end up going to their Twitter handle Notwithstanding the fact that they say they record call, I wish they could listen to their own calls when they will be busy enticing us to get a contract line, they lie kuthi i would be getting 25GB anytime and 10GB night, yet i am getting only 20GB which just disappears in a space of 4 days, so disgusting i am frustrated.