UPGRADE PROCESS IS TERRIBLE

Hi, on the 1st of September 2015 I went in to MTN Stellenbosch square to upgrade my contract as they were the only branch with the Note 4 in stock, first of all they are 70KM away from me, I phone the guy named Wesley the day before to reserve a handset. Everything went well till he told me my credit limit is not enough, however my credit limit shows R1000 on my side but R600 on their side, A few unsuccessful call to their service centre and emails going to them as well we got the conclusion that the limit will be raised, then the limit has been decreased by R2 instead of being increased. I phoned customer service more than 5 times and every time I ask for the person I spoke to before all I get is that the person is not working there. The thing is I don't need my limit increased as it is more than enough, but on their side its not enough. I spent more than two hours in the store while I had to get to work, as off now I'm still waiting for response from them, This is ridiculous.