Vodacom service sucks!!!

My husband and I took out similar contracts at Vodacom and I was made aware of the vat increase via sms but what I am not aware of is how Vodacom is trying to cheat me. I have fixed priced contract and went to Vodacom Tygervalley to query the statement amount of almost a whole R50 extra on my contract, I was told to contact the Accounts department as the consultant could not understand why I am being overcharged. I called the Accounts department only to speak to a very unprofessional consultant,she had no idea what was going and on top of it she was having a personal conversation with her colleagues regarding coffee while I was on the line,she gave me a lot of different excuses including the fact that I have received extra data which I clearly did not. I refuse to pay this ridiculous additional amount to my contract and I will find a better service provider that won't try to rip me off.