Daylight Robery

On the 28th March I posted a review regarding poor service from Vodacom. After a delayed response, I was eventually assisted and promised that my current contract premium would remain the same. After the 1st invoice it went up by 10% and I was told it was attributed to the 1% increase in VAT. Which made absolutely no sense. I have sent emails questioning this and have had absolutely no response from Vodacom. I am currently based in another country and am unable to make the call to them. Fast forward another 4 months and my premium has now gone up again. How is this possible or even fair? If it didnt cost an arm and a leg to end a contract with Vodacom, I wouldve changed service providers a long time ago.