VODACOM'S SHOCKING NON-EXISTENT SERVICE

My daughter purchased a cell phone a few years ago. I added a data contract on to my main contract for her as she was going away to study to assist her. I was recently contacted by Vodacom to upgrade her package to 2Gigs of data. I did not need a new phone, however my account has been charged with an additional R779.93 for "equipment - balance of contract". There was never a phone purchased as part of the contract, nor any other equipment. The phone was purchased and paid for in full by my daughter. Vodacom is now refusing to deduct this from my account. It is blatant ******* and I am completely disgusted with Vodacom's service. They do not follow up or resolve issues. I want to cancel all existing contracts with Vodacom as the service they provide is simply not worth the headaches and additional costs which they feel entitled to charge a long-standing customer. I am just disgusted and need this to be resolved immediately.