Poor Communication

I received a telesales call 2 years ago with regards to an account - I agreed that I might use the account and waited for the notification of my card. I did receive the sms that the card was ready but I never got a chance to go and collect the card. One year later I still had not collected the card and decided that I did not need it as I don't shop there often. Two years later (from the original call) I get an sms that card fees will be charged to my account. So I think someone opened an account in my name and I contact them to which they reply that I have most probably been handed over for account fees not paid the last two years and I must have received statements from them as the post office didnt notify them of non delivery (I have never received one letter or sms or anything telling me that I owe them money or that the account is active). Now it has been referred to their legal department - my question is just - if I say yes I want an account but I never sign for a card to use the account or never hear anything from you again with regards to the account how can you now want to charge me for a service I never even used?