Vodacom terrible service

Good day

I have been away from vodacom for more then 2 years and suddenly they have manage to give me over to MBD inc for not paying my account. But in 2017 when I left vodacom I give all informative regarding the phones that was bought on my name to vodacom ***** department to handle as I was at work when the phones were bought and im living in mpumbalanga. the phones were bought in cape town somewhere. Now after more then 2 years they want R 31000 from me for phones that I don't have and never had. Vodacom have very poor service and customer service was terrible when i wanted to find out where is the proof that i bought the phones they give me the run around that i must first have proof of residents and bank statements and all that before i can see but there was nothing required wen the phones was soled with out me knowing about it. Vodacom ***** department needs to speak with the rest of vodacom to know were there problems are.