Vodacom changes my information

I have had 2 contracts with Vodacom for over 2years now and over the years I have phoned the call centre many times,even upgraded and cancelled accounts.Now ALL OF A SUDDEN my name doesn't match the ID nr on their system and they refuse to help me. How can the ID nr just change? If the ID nr is wrong, how have I been able to upgrade and cancel accounts using my ID book??? The manager didn't want to speak to me and suggested that Rendani phones me back \when I have the correct information."Where am I suppose to suckle a random ID number out of? The contract has my name my bank details my address on it but SUDDENLY the wrong ID number?How am I suppose to know who made the mistake?Who has access to their records to change their things?The whole purpose of my call was to find out why my contract's data for Oct has disappeared in 4 days when my last debit order is only going off on the 1/Nov according to thecagent who helped me a month ago (WITH MY CORRECT ID NUMBER).I already paid for Oct's data"