No one willing to help!!!

I have phoned head office a couple of times and I have also spoke to individuals at different service stations. My upgrade is due in June 2016 and have asked to upgrade sooner and I am willing to pay in to enable me to upgrade sooner. I have just started as FM with a firm and my phone is not working any more. I am currently using my tablet as a phone, which is causing a lot of problems . I have explained this to everyone I have spoken during this time and each and everyone says they can't help me as vodacom has changed over to a new system. No one has tried to even make a plan to see if they can assist me. Above all this I have realized that someone has added 500mb to my account last month. I have phoned to cancel this 500mb as have not agreed to this in any way. This month it has been added again. Now it is a battle to try and receive a refund on these amount.s So far I have decided to move over to CellC if I still do not get a response. This is really absolutely poor service from Vodacom as everyone just raise their shoulders and clearly showing that they do not care. Even the call centers has a phew times picked up the call and just dropped and I had to phone again and again.