********** account

I had an account with Russells Setsing some time last year but have cleared the debt with the shop,yesterday I got the statement that states that now I have a new account with russells and that my account is in arrears when I know well that I do not have the account,I have called the customer care and was repeatedly asked if I'm implying that the account is ********** of which I rep**** yes because I have no knowledge of such account,please sort this out as it will give me a very bad credit rating because i dd not open that account as I was not even around the branch at the time that the account was opened.