A demand letter is a letter you can send to try to resolve a dispute before going to court. Demand letters are often sent in cases where someone owes money.Settlement demand letters are used in most personal injury cases to begin settlement negotiations. Fill-out and send in form and supporting documentation establishing your right to receive the property. Procedures to follow when filing a claim: City Secretary's Office City of Houston Post Office Box 1562 Houston, Texas 77251-1562 Facsimile No.: 832.393.1109 We all get a lot of junk mail. So, if you get a letter that says you have unclaimed money you may not trust it. Use this online tool from Lone Star Legal Aid to file an answer in a debt collection lawsuit in Justice court. Make sure sender's last name, first name, and return address are on the envelope. 4. Draft and Send Demand Letter in Houston, TX requesting money, possession of assets, or action on a matter.