no service

I signed up for a contract with mtn for my business a year back. It is a data and airtime contract. Now for the last 12 months I had the worst service available. And when you ask about the poor service all the meyerton branch says is they don't know, or its because of upgrades. Can you really upgrade for the best of 12 months.<br> <br> I am paying a lot for the service and really think this is very very unfair that I have to exchange my cellphone cards the whole time. Cell C is doing a lot better. So I think you can cancel this contract that I can go to Cell C where there is at least signal and a desent person who will look into the problem for me!!!