I've been handed over for an account not mine

I have been with Vodacom for more than 20 years now, same number with a debit order on my account so never had outstanding payments. A few months ago I tried to sign a new contract for a data bundle and I was denied because apparently I have been handed over to legal. I went to Vodacom The Glen they told me there is nothing outstanding on my account i must go to the branch in Alberton which I duly did only to be told I must contact the legal department. This took a week or two as I was never actually able to go through to legal and was given various numbers to phone which never helped. Eventually I got hold of someone who told me to get a affidavit and to fax it through to the legal department they will investigate and send me a ref no. Non of which happened I have since forwarded this document twice more, still nothing. This has been almost two months now, i then tried phoning again only to get the same run around phone this number phone that number one which does not exist anymore. After having spoken to several people who where very unhelpful, I even asked the one guy Daniel to give me a direct line of someone in legal he said that they where not allowed to to this. WHAT MUST i