Billing

I'm not happy with how vodacom bills me, they first stopped debiting my account, i paid everything and asked for the debit order to be reinstated and wasn't, every time i get an invoice it's a different amount for a contract of R 252 plus caller line identity, but i get amounts up to R 400 every month, and every time i call the call center i get reference numbers and never feedback and the consultants never know how to explain the amounts or give you break down. can someone please assist.