***** - Upgrade done on my account

I went to the MTN Cresta branch last week 29 October 2015 with a Wifi query - upon opening the account I requested that a hard cap be put on my Wifi account. This was not done and I received an account of R1400. This I had to paid. I was then informed that I upgraded on Monday which I did not do. Apparently internal ***** is happening at the MTN stores. I was then told to go to the nearest policy station to do an affidavit. This was done within half an our and relevant documents given to MTN Cresta. I was informed that someone will keep me updated on the ***** case. A week later nothing has been done. I phoned this morning 5-11-2015 and left a message for the manager to phone me back. No one phoned back. I phoned MTN Cresta again and spoke to the Manager. She confirmed she will investigate and get back to me. I was still busy on the phone with her when she put the phone down in my ear. I have been with MTN for years and am shocked with the service. I am worried that whoever upgraded on my account might have all my banking details etc.