ACCOUNT TO CREDIT BUREAU NO NOTICE!

I closed this account in June 2013 all paid up and went overseas. When I came back in December 2014, I found 1 letter dated Nov 2013 informing me of one month arrears.When i tried to pay, i was told the account was closed and the legal division was dealing with it. The legal division have no record that I am owing but my credit record at the bureau has a bad record on this. I have tried several times since December last year to sort this issue out but every time I am told that they will email me and they will update the credit bureau and they have not done so till now. I don't even know what to do now, I am dealing with this matter from the UK and it's cost me so much to make these follow up calls already. Come on Vodacom, get your act together!