wrong billing

Vodacom has been billing me and enormous amount on my account of which no one knows about. I have struggled for the past 3 months reversing debit orders and now my cheque account has RD and my services has been suspended. I have called all the departments no one seem to know why am I being billed the amount they are taking. I am sick and tired with the Vodacom I really feel that they are unprofessional and they don't care about their own customers. I use my phone for my business, now I cant do anything... this is bull dust.