Incorrect listing

I have for weeks been calling Vodacom's various offices seeking help. I have a contract with Vodacom and have been correctly listed as being in arrears with credit agencies since October even! this came as a shock to me since my account is completely up to date. Call operators say that the credit info is updated regularly, which is a blatant lie since I have seen with my own eyes that it was last updated October 2014. I'm absolutely frustrated trying to rectify this error, as I have received no help on multiple attempts.