Oh sorry. I misunderstood and though they had re-dated the debt.
If they just called they are likely bluffing. It is a violation of the Collection Agencies Act to report it. That being said collection agencies do it all the time. They make up fake activity and then reset the six year clock.
Buy a credit report from Equifax and find out if it is there or not. They are $15-20 and you'll know. If you are worried they might try to sneak it on sign up for Credit Watch $13/month and if they try you'll get an e-mail.

