Incorrect Billing / Debit Order - Query

I have been struggling with Vodacom to clear up an issue on my Data Billing for a 3G Data Account, first raised with Vodacom on 1 September 2015, after numerous emails and calls, i still havent received clarity or a correction on the account, after sending evidence that the billing cannot be correct. i am still having ludicrous amounts deducted on a monthly basis