We filed a lien on a property where we did a roof. Roof finaled and photographed and supported by Chief Building Inspector. Customer has not paid a dime. We let the lien expire because we were told could be as much as $15k to take to court (same amount as is owed and customer appears to not have ability to pay.) Customer sent demand to release the invalid lien or he will sue. Can we just counter sue in this situation? We are comfortable with our installation and witnesses, but don't want to put a lot of time and money into a customer who we don't think is employed etc. It was evident to us in the installation process that customer was avoiding our workers, etc and refused to answer phone, emails etc when it came to payment.