Are you sure it isn't just a scam?
The above is not intended to be legal advice, but may be used for general information. Please contact an attorney for specific help tailored to your needs. www.figgardenlaw.com
It could just be a scam, but I have seen that same language on some billing statements from legitimate debt collectors. What I would suggest is that you send a letter back to them stating that you do not remember this debt at all, that you dispute that you owe it, and that you request that they cease all attempts to collect it from you. Send it certified and keep a copy of everything. That should make them go away.
I am licensed only in Texas. Offering information of a general nature in response to a question is not intended to be legal advice in your state.
The statute of limitations on a debt in TX is 4 years. So after 4 years you have a defense to a lawsuit if they file it that would bar recover. A creditor can report on your credit report all activity for 7 years. If they give a negative report that will hurt your credit score. These are the time frames often associated with collections. If someone is contacting you about a debt but says its to old its most likely a scam because it is an very unusual statement and is ignoring a lot of deadlines.
This answer does not create an attorney-client relationship. The information provided in this post is not legal advice but is general information. If you have questions concerning your specific situation, you should consult with an attorney in your area