Poor customer service

I'm on a contract with MTN and I was able to pay 21 installments and failed to pay the remaining 3 due to unemployment. I recently called their centre and was told that my contract has been handed over to the Direct Channel credit management. I was given three different numbers and they do not go through, there's also no information on the internet about this company. What infuriates me is irregardless of the fact that MTN has closed my line they have not tried to contact me whatsoever to inform me that they are handing me over. They have my email address instead the only communication I receive from them is regarding promotions! I want desperately need to make payment but how can I do that when the people you referred me to do not "exist". Your call centre is not helpful at all and so is your head office since I called them as well. I recently went to your website and left my contact details for your assistance. MTN is very unprofessional, Unreliable and has the poorest customer service. This complaint follows the one I made last year when you guys double debited my account although I had paid! I provided proof from my bank so I could be refunded but till today , you told me you cannot trace my payment! How useless is your network!