Upgrade processed incorrectly and not resolved

I have been trying to resolve an error that VODACOM made on my account for more than a month. Somebody made an error when capturing my upgrade and I was INCORRECTLY placed on a pay as you go contract, my voice mail was deactivated and I have no caller id. I was not able to receive any calls at all for 2 weeks. When I go into Vodacom stores to try resolve this I am told that they cannot access any of my information as I have been randomly selected to be trialed on the new 3D system which the stores have not even been trained on. Upon calling the call Centre probably more than 20 times and even going to vodaworld in midrand as this is where I opened my contract, this has still not been resolved. I have been purchasing data bundles through FNB so I can operate my phone but I rely heavily on my phone for business and as I have not had access to voicemail for more than a month I have lost large amounts of revenue. This is beyond ridiculous and inefficient. This issue needs to be corrected as a matter of urgency!!! I am ready to cancel my contract. I also just received a larger than normal phone bill after not even having use of my phne for more than a month.