Incorrectly given wrong account balances

on the 20/08 I called Vodacom to find out how much will be debited off my account at the end of August, I was told R818.94, which I have the ref no ***. I got a debit off my account today for R 3 282!!!. I contacted the call centre today to find out and they said I was given the wrong value ref no ***. Who's fault is it that they gave me the wrong value, if that is what I was told over a recorded conversation I do not see why more money has now been taken from my pocket!!! I was told to expect a call within the next 24hours from the team leader to which i am waiting!!! if that is the value i was quoted to go off my account that is all i will pay I want my money back it is not my fault you quote your customers falsely