BREACH OF CONTRACT

I have reported MTN before regarding my mobile contract but they just do not respond. I have send the documentation through to the legal department to customer care and all I get is an automatic reply no response. I had no reception in Irene where i work and where I stay they agreed to put up a signal booster, send me the documentation which I returned last year in April. No response, no response. I have subsequently reported the company to consumer council and was forced to open another contract with a mobile phone supplier where I could get service as our business depend on it. I then decided that I will just stop paying, but since then I have had no response no e-mail, no invoices nothing. On the 25 February I received an e-mail from a collection company, I once again sent all the documentation and had no reply