Incorrect Amounts Debited from my ACCOUNT!

Absolutely shocking, ever since I got this contract with Vodacom my account has been debited incorrectly, Ref number *** The amount is supposed to be R280 each month December - R314.60 taken Jan - R658.86

called on the 1st to log the dispute, was told its been escalated and that the money will be refineded in 24/72hrs, typical today is day 5, no communication, NOTHING. Called this morning was told its been escalated and that means 7 -10 business days? What am I missing, you take money happily out of peoples accounts but take forever to refund the incorrect amounts. I am wondering if by the end of Feb Vodacom will have someone who is processing the accounts do their debits correctly! This is THEFT!!!!! I am absolutely furious