Shocking service and no response to complaints.

I have been trying since the 10th of December for mtn to assist me after repeated rejections on my contract application. I went into a branch to do this. We bought the modem too. The application was rejected so I said I would look into it. I checked with several credit agencies and my credit score is good. I went into the branch again and was told by one of the agents that she would get her manager to override the system and that it would take 24hrs. I waited and heard nothing so went back 2 days later. The manager said he knew nothing and could not overide the system. He could not tell my why, just said that the system rejected the credit check. I am trying to take out a R249 pm contract for my 91 year old father. Home internet month to month. No cell phone, just a month to month data plan. No risk to MTN, if i default i just do not get any data?? When I called in at the branch again I was told that the system credit check failed again. I have a good credit score - checked with several registered agencies and do not owe on any of my accounts. I was told at the branch that it is PROBABLY because I am not paying any accounts that I cannot get a month to month data contract? To date this has not been resolved after sending numerous emails both to MTN customer service and then two seperate ones to the complaints department. The automated response says I will hear from them in 24hours. The last message was 5 days ago. There is no number to call if you wish to speak to someone. Over a month later and no resolution to my issue. In the meantime I have to buy their expensive mobile data. A response or answer as to what the issue is would be the least I expect from them. Such a time and money waster.