I don&#x27;t believe it is illegal for a collection agency to try to collect on a debt that is beyond SOL. If you were to not realize the debt was past SOL and made a partial payment the debt would instantly no longer be past SOL. Which is why some agencies will try to get a debtor to pay on debts beyond the SOL.<p>However, if you know that the debt is beyond SOL you may tell the collection agency to stop contacting you. If the collector continues to call you after you send them your letter, they may be violating the Fair Debt Collection Practices Act[1][4] and you may be able to sue the collector for damages[2][3].<p>[1] <a href="http:&#x2F;&#x2F;www.consumerfinance.gov&#x2F;askcfpb&#x2F;1405&#x2F;how-can-i-stop-debt-collectors-contacting-me.html" rel="nofollow">http:&#x2F;&#x2F;www.consumerfinance.gov&#x2F;askcfpb&#x2F;1405&#x2F;how-can-i-stop-d...</a><p>[2] <a href="http:&#x2F;&#x2F;www.fair-debt-collection.com&#x2F;rules&#x2F;civil-liability-13.html" rel="nofollow">http:&#x2F;&#x2F;www.fair-debt-collection.com&#x2F;rules&#x2F;civil-liability-13...</a><p>[3] <a href="http:&#x2F;&#x2F;www.nolo.com&#x2F;legal-encyclopedia&#x2F;damages-fdcpa-violations.html" rel="nofollow">http:&#x2F;&#x2F;www.nolo.com&#x2F;legal-encyclopedia&#x2F;damages-fdcpa-violati...</a><p>[4] <a href="http:&#x2F;&#x2F;www.nolo.com&#x2F;legal-encyclopedia&#x2F;illegal-debt-collection-practices.html" rel="nofollow">http:&#x2F;&#x2F;www.nolo.com&#x2F;legal-encyclopedia&#x2F;illegal-debt-collecti...</a>