DISASTROUS UPGRADE!!!

I am a loyal client of Vodacom since May 1996!!! I have 5 numbers on my contract with them. During February this year I was due for an upgrade and was phoned by an agent offering me 2 data contracts with routers included. I also requested a quotation for the 2 cellphone upgrades. The lady didn't phone me back, but a guy phoned me and was offering me quite a good deal. After numerous promises, phone calls and messages I received 1 of the phones on another contract period as dicussed (allocated to the wrong number). I also received 2 routers, totally on another contract that what was discussed. It was a total disaster after that to try and sort out my account. I received the second phone, once again on another contract period. After months of trying to resolve this matter I got blacklisted, since I paid the amount that was discussed, not the other contract period!!! I went to Vodaworld with áll my evidence, after explaining the situation over and over again and everyone just pulling up their shoulders, I found a lady that understood the situation and she promised me to help me to get this whole mess sorted. Another month went by and then I received a call from the Online Service Provider that explained to me that they listened to áll the recordings and they admit they were in the wrong. So they debited my account and said each month I'll receive a 'wrong' invoice, but then it will be rectified and I'll only pay the original amount!! It happened only ONCE!!!!! Never did I receive a corrected invoice again. And once again no one is willing to help me. The lady at Vodaworld that promised to help me is now reading my messages, but not replying at all. The Online Service Provider is not answering any of my calls an the agent that I spoke to initially promised me to help me to sort this out. He claims now that his supervisor is suppose to contact me so that they can adjust the statements, but till today there was no response at all!!!! Since February till now I am trying to sort out this upgrade! After all these years being a véry loyal client I am totally shocked that there is NO CUSTOMER SERVICE at all available!!!! I can't even get hold of anyone to end all my contracts with them!!! What should I do??? I am totally desperate!!!!!