**********ly purchases

I have noticed that despite paying my account every month the buying power does not increase but I concluded that maybe it has to do with the credit profile or something. last week I paid R350 into my account but after 2 days I got a message from the Hub telling me that my account is in arrears I need to pay R114 urgently, that came as a shock and I immediately called the Hub head office to find out what the problem is. and I was told that I had made a purchase of R400 in Durban and I have never been to Durban. I was told to go and get it sorted out at Nedbank but when I got at the bank the lady who assisted me seemed to be clueless but she told me to go back to the Hub as they are the only one who have a better explanation of what is happening with my account. I really need an explanation to this because its clear that someone has been using my account **********ly. I want this to be investigated