first, do check your credit report. If the debt is listed, send a notice of dispute to the credit reporting agency(ies) that are reporting the errant debt.
then, send a letter of denial of the debt and to demand verification to the collection agency. You need to do so within 30 days of receiving the first dunning letter.
Additionally, if you simply tell them you are not going to pay the debt, they must stop all contact, until/unless they sue you. It serves the same purpose as a cease and desist, which you could also send rather than the refusal letter.
Personally, I tend to suggest not sending a cease and desist or the refusal simply because getting a letter from them is not a big issue and it allows you to continue to be sent notifications of their actions. I like to know what they are doing, or intending on doing rather than living in ignorant bliss.
I failed to follow up with Darla here and I see a question or two I did not answer.
She asked about a renewed 7 1/2 year period to report the debt to the CRA's (credit reporting agencies). That cannot happen (legally). The debt can only be reported for 7 1/2 years from first delinquency, period. After that time, it must be removed from your credit report.
and understand; a statute of limitations regarding a creditors right to collect a debt only involves how long they can utilize the assistance of the courts to seek repayment. It doesn't apply to you since your claimed debt is not valid anyway but just wanted to follow up on Darla's situation and toss this out there. A creditor can sue you, even after the statute of limitations has expired. The affirmative defense of the expiration of the statute of limitations must be offered in a response to a summons/complaint. If one fails to present the defense, the plaintiff can still obtain a judgment and you cannot go back and argue SOL after that point. You either use it or lose it as a defense when sued.