Vodacom continues to de***** UCT

In April & May 2015 I wrote a complaint about Vodacom charging the University R788.99 per month on a 5 GIG top-up account which I personally signed-up for R259 pm. Via that initial complaint I was requested to submit ALL information to them. This I did and Linia Malachi contacted me on May 20th, 2015 via email for ALL the information AGAIN. This I did but according to our financial office, UCT was billed R788.99 again (no refunds for the previous overcharged costs!) for a R259 per month contract. Now I do not know what more to do to effect what I perceive as gross negligence to correct something I regard as fairly simple. Admit that your company has messed up and adjust the monthly debit order to R259 as was agreed to and refund what has been taken off incorrectly. Why is this so difficult and why do they really not care? After more than 5 months trying to get the right thing done there has been no change as the same incorrect billing has gone through again for July 2015- even after `i received an email saying that the charges will be reversed- I give up the consumer just can't win with companies like Vodacom.