Account handover or blacklist

I have no idea that i have an account with Vodacom, I have about 4 mobile numbers with Vodacom which are all prepaid and I spend more Than R3000 a month on those. I am very SHOCKED to get a call from their so called attorneys when they themselves have never called me to tell me about these so called outstanding amounts. I am so appalled by their conduct i almost want to vomit. I take good care of my accounts and debts that i feel i don't need this **** from a company that I subscribe and give my business to. I am moving all my numbers to MTN tomorrow it is clear that Vodacom does not value my business I am not even worth their communication when they're in telecommunications. I am so sickened to my stomach I can't believe i gave them my business all these years and they want to treat me like a ******** or a second class citizen. To hell with this company.