Vodacom Contract Mess Up.

Wow i honestly want nothing to do with Vodacom anymore. So in September i get a call from a lady telling me that i qualify for an upgrade, she was very friendly and so i agreed to stay on the line and hear what she has to offer. I knew that my contract only ends in October so i asked her multiple times if i upgrade now will i not be billed for both the old and new contract at the end of the month cause this had happened to me before, she multiple times assured me that, that will not be the case. She said that i would be billed for the old contract at the end of September and from October i will only be billed for the new contract and the old one would have fallen away, i though this was a great deal and so i took it. Come end of October here comes my bill for both contracts. I have been trying to resolve this issue since 25/10 and on 18/11 Vodacom went on and suspended my line. I have called multiple times and still nothing, i have requested for the recording but no one can help me with that either even though we always hear how the calls are recorded. I have been with Vodacom for about 10 years now, but honestly i think i am done with them. My life is at a stand still, cant make or receive calls because of Vodacom's mess up and they don't seem to be willing to resolve this. I have been blocked from even making calls to Vodacom, when i dial 135/ 082 135 it says that the number does not exist.