Over charged for my insurance

I am very upset at the service that I am receiving from Vodacom, I was grossly over charged for my insurance my installment had to be R69X2 but instread i was billed R204X2 = R408.I logged my complaint on the 29/01/2015 before my debit order went off and was advised that it could not be reversed by a team leader called Thabelo and that as soon as the debit order goes off, it would be rectified. Todate I have heard nothing from her after promising that she would call me. I then call the whole of last week with no luck from any of the service areas, speaking to Ali, Nicky, Kagisho to name a few they rather transferred me to 10 different people and all making promises that someone will call me to action the refund request into my bank account Which has still NOT happened. It is now the 9/2/2015 and still no FEEDBACK NOT EVEN A CALL TO FIND OUT IF MY QUERY WAS RESOVLED.This is really unacceptable!!!