Vodacom Handed Me Over - For A Non Existent Contract -

I cancelled a contract with Vodacom last year - The faulty device was returned - I have all the documentation from Vodacom -

Feedback with regards to the service request with reference number ***, is as follow: "We Cancelled the 20GB Top Up Data package for the number *** as per the Letter received from the Chatz Vodacom Sunninghill store."

I was assured that the matter was resolved - I have been handed over for R200 to a collection firm called MBD - they have been harassing me with calls and SMS's - And are threatening to blacklist me -

Shame On Vodacom - What is broken in the chain? I have spoken to several people last year 2 individuals this year who asserted that I owe nothing to Vodacom and my matter is settled - How on earth can an agency pester me for R200 and threaten to blacklist me? How? Please address this urgently - Or I will escalate to the Money Matters show - I will escalate on all social media platforms and I will write a letter to the Ombudsman - Disgusting