Vodacom is charging more than the signed and agreed monthly installments

Be CAREFUL when you sign contract deals with Vodacom! I have e 4 lines with vodacom. I have the original emails with the contracts of each stating that the contract amount is the amount including vat. Vodacom is charging me more every month on my contacts and there is NOTHING I can do about it. You can only speak to Tobi the robot that's absolutely USELESS AND FRUSTRATING and if you're lucky enough to speak to an consultant you have to deal with bad attitudes and *********** call center agents who CLEARLY are not knowledgeable about taxes and vat. I asked to speak to a manager and there isn't any higher up than the uninformed and unhelpful call agent. At this stage I only think that the Ombudsman will be able to help me...