Vodacom is a poor service provider

I did a pre mature cancelation on the 20/12/2018 and paid the money owed to vodacom. Cancelation department confirmed the cancelation. After that I have received numerous calls saying that my account has been handed over to legal department. I explained and send my proof of payment and was assured everytime that my account has been sorted out. On 26/06/2018 I received a call from mbd inc saying my account has been handed over to them and I have to make a payment or blacklisting is eminent. I phoned vodacom and no one is able to assist. I do not reccomend using vodacom to anyone as they are theives. This is disguisting service.