bad credit card

I was contacted by collection agency an account that was charged off 8 years ago. They said they bought that debt and are reporting it on my credit.

I asked for written records with my signature to ensure that it was a real account that I opened. They said that it had been validated by the orginal credit card company, but they could not supply any records with my signature.

Can I have that removed if there are no records with signatures showing that I ever opened that account?