Vodacom customer service

Last year i upgraded my contract with Vodacom to which they informed me because i still have 3 months remaining on my contract i have to pay that amount on top of the amount of the new contract until the end of the old contract which was fine, that ended two months ago. According to my Vodacom app i am now paying R175 extra for line rental, that is something i never paid for with my previous phone. So i go to the closest Vodacom store to inquire about this to which they tell me phone 135. 135 keeps me on hold nearly half an hour so i go to another store to which they tell me the system is slow and they will phone me to come back when its up and running so i walk around the shopping centre aimlessly waiting for their call which only came the next day. The consultant that phoned me said he was not sure about the amount and will ask the other consultant to phone me which i am still waiting for four days later. Highly unimpressed with Vodacom and the customer service considering they have an automatic message that plays when they phone you for the remaining balance instead of an actual consultant. What does it take to actually get some assistance and answers from Vodacom???