get couple of strong guys with you (like FLAN for example...he he he), go to his office somewhere at the beginning of next month, when he for sure got his salary, let guys push him into the car, bring him to the ATM machine and make him withdraw your 500 right in front of you, then let the guys kick his a$$, and leave him on the street...

*********************
“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry