Hi gioziggy
Welcome to the forums. You do have your legal rights to ask for a debt validation letter before making any payment on a false pretext. Have you check the SOL period of this debt if it is collectible or not?
Apart from that, please be very careful if they are making you a victim of identity theft. You can lodge a complaint at the Social security or the FTC at the following number
Telephone— 1-877-IDTHEFT (1-877-438-433

TTY—1-866-653-4261
Please check if your SSN is protected by ordering for your social security statement. It will list all the earnings posted to your record. If there is any error, you might be the victim of identity theft and need to lodge a complaint right away.
Please let us know your feedback
Regards
Roxette