How to dispute fraudulent debt from collection agency

Did it only have your name?? No other identifying information such as address, birthdate or SS#? Heck there are 15 other people with my name in my metropolitian area...could they have the wrong person??

I never lived at the address on the bill.

Then they havent validated the debt. Wrong person, wrong address. Do you have anything to show that you lived at a different address at the time of service??

I have lived at my address long before time of service. Do I have a time limit to respond to the CAs letter?

30 days from receipt of the first dunning letter is the timeframe per fdcpa. File a police report and send them a copy of the FTC IDT affidavit. Inform them that if they pursue this matter, then you will have no choice but to file suit against them. Once they recieve the IDT paperwork, they must cease collections. Also send the paperwork to the OC. Have you pulled your credit reports? www.annualcreditreport.com If there are any other fraudulent accounts or Inquiries on your reports, identify them and send the police report, IDT affidavit and proof of ID to all 3 CRA's. Make sure you have a fraud alert placed on all your reports as well.

FYI...when I was in collections, we had some pretty crappy skiptracers. They would enter the first name match without verifying which could be the case here. Not ID theft but lousy skiptracing. Definately check the credit report but if the OC has a common name, I would be talking to the CA first to find out where they got their info from.

My credit report does not show any info about this alleged debt.
What is the time limit for me to respond to the latest ltr from this CA?

Sounds like IDT. Go to www.ftc.gov and follow the steps for ID Theft.