Bad service ever!!!

Kindly assist, I canceled mi contract in April 2021 with vodacom, actually I requested a full settlement it was sent with all the detailed amount I owe, made a payment in their shop everything was processed they even converted my number to prepaid, following month i bought another phone no one told me I'm owing no one ever contacted me to tell there's a balance on mi name or even debit since I was paying via debit order until recently wen I received threatening smses and calls from a company called vvm telling me to confirm my I'd number because I'm in arrears, contacted vodacom spoke to their consultants, they said mi account was canceled i asked them to email me proof Nkosi said they cannot send I kept waiting for hours on a call waiting for their supervisor, Portia promised that I'll be contacted by their team leader till today I'm still waiting and my issue is still not resolved... vodacom ur staff is very *********** its started with an insurance now its the cancelation of contracts why do we have to call ur staff to do their jobs vodacom sucks 😐