Depends on the state and the terms of the purchase agreement. Hire an attorney and sue, if it makes sense in your situation. If not, in the future, use a realtor or attorney as the escrow agent. The risk is minimized since either would not be willing to lose their license over such things.
Small claims court.
If you have sufficient proof, take him to small claims court.
Your only recourse is to sue them in small claims court. You will need some proof of the loan.
Buy a gun, or bring a few big guys with you to collect. You have no recourse, because there's no paper trail showing your terms of employment. You can file a claim against the person who owes you in small claims court, if you have believable witnesses to collaborate your story.
Small Claims Court
Collect and Verify Patient Information
You can take action, however, it has to go through small claims
YOU SUE THE ESTATE
Do you mean an Impound yard or Pay for parking garage? If so, they are but you may have to go through small claims court to collect.
Nothing
His job is to collect information and to investigate claims for the insurance company he works for.
Through the Judicial system - take them to court. If the amount is small, you might consider small claims court. There, the process is informal and attorneys are not allowed. See the below link for details.