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I don't know how old your child is, but a child support obligation generally can be enforced for 10 years after your child turns 18. If your child is older than 28, then the limitations period would be passed. If your child is 28 or younger than the limitations has not expired and an action could still be pursued.
Thus, you would be obligated to pay any child support obligation you still validly owe because you did not pay it.
To verify whether you actually do still owe some portion of the obligation (what the collection agency is asking for), you need to make a written (letter) demand to the collection agency under the Fair Debt Collection Practices Act. Under that Act they have to verify the amount owed.
Here is link to that Act which you can review for the fine detail regarding such a request and their duty to verify the debt.
Section 809 addresses what they must do.
If they fail to properly verify the debt, then you can file a complaint with the federal trade commission
and your state attorney general
. Failure to verify the debt means they cannot continue to collect it. It would then be up to the holder of the debt to determine whether they want to sue you in court to try and collect. If they did, you might have the statute of limitations
defense noted above depending on how many years have passed since your child turned 18.
In any court proceeding (if they do sue you), then they would have to prove that the debt exists. It is their burden.
Thus, if the collection agency doesn't verify the debt and you feel you don't owe it, there's no reason you should pay it unless you're further contacted by the owner/holder of the debt. In that event, you should probably consider paying the small amount of the debt as defending against a lawsuit, even if you win, will cost thousands of dollards and take hundreds or thousands of hours of your time.