Vodacom best service providers in South Africa??

I am highly irritated! Vodacom was phoning me regarding my "outstanding account", I had no notification that after a contract I would still be paying for something. I thus reversed the transaction and explained my concern to a lady at vodacom. After that I had numerous calls all of *********** consultants, all on various occasions when I did answer, I requested to speak to a manager and not one manager came back to me!!! Now my account has been handed over to debt collectors?? This is ridiculous. I will be taking up this matter further should I not get a response in the next 48 hours.