no response

long story but will keep it short. I went for an upgrade in march 2015....in my first week they terminated my service, when I inquired why, they said I had used R3000 over my limit. I went in to see them and ask for a detailed bill of what was used before I pay them, it is now going in for the fifth month and I have received nothing from them yet. I have been going into the shop weekly and spoke to the supervisor, she has said that there is nothing more she can do for me as it is at legal, why is it at legal if i am waiting for an investigation into my account, do they want to add those fees as well? I have offered to pay my normal subscription excluding the R3000 but they wont except that either \as it is at legal".. Can somebody please help me as I don't know what more to do. I have bought another sim card in order to use my phone as I run a small business from it. I have no e-mail address"