2 weeks and still no response!

I went to the Canal Walk branch 2 weeks ago to log a query. I was served by Rowena, who advised me that the problem was that when I did my upgrade 2 months ago, they loaded me onto the incorrect contract. She sent me a reference number but to date even after numerous follow ups from my side, there has been no response or resolution. Surely if MTN is at fault they should resolve issues speedily. In the mean time I am still being billed the incorrect amount and there is nothing I can do but WAIT. So sick and tired of poor service.