Isn't the court ordered judgement the final word??

A man won a judgement against my stepdad in court for $480.51, which included the court costs, taxes, etc. Whenever my stepdad contacts the guy to make payment arrangements, he gives him the run-around. His contact number is a GA number (where we live), but the guy always says he's in Vegas and does not have access to review judgement file. He changes the amount to be paid constantly, currently he has raised it to $550, saying that he has to add interest and taxes. He refuses to give a mailing address, only a P.O. Box, which would make it hard to verify whether he received the money or not. He wants to be paid by a money order, not a check. My stepdad has been waiting two weeks for the man to mail him a statement to negotiate the amount to be paid. I thought that if you have a court judgement for a specific amount with all fees included already, then that is what you pay. Does this guy have the right to add interest and tax after the fact? I suggested my stepdad send the guy a copy of the judegment stating the amount owed and a check certified mail with return receipt/signature, is that a good idea?

Dad needs to only pay the amount awared (If award includes interest then compurte interest)

CAUTION: Especially in contect of your post,  it is UNSAFE to pay the guy absent  confirmation that a written safisfaction has aslo been filed with court as to the debt--if a written safisfaction piece is not filed then the debt simply stays on records and creates a future mess--it is Plaintiffs duty to file the piece and there is normally a fee to file it ---but I would NOT skip this step---there is no short cut to safety.

If I owe you money I insist you get the step done--you or your agent meet me at courthouse and  you or agent bring the satisfaction piece and  you record it and at same time I'll give you good funds in cash or certified check or money order

Drew:

If I owe you money I insist you get the step done--you or your agent meet me at courthouse and you or agent bring the satisfaction piece and you record it and at same time I'll give you good funds in cash or certified check or money order

Drew, if you owed me money on a judgment and insisted on that, I'd take a pass if it was not convenient since I'm not required to meet you at a place of your choosing to pay the judgment. I'd instead simply execute on the judgment and collect it that way. If, however, you paid me by certified check, I'd promptly record the satisfaction piece. In my state and many others, there are sanctions the court can impose for failure to timely record the satisfaction.

My stepdad WANTS to pay but the guy is giving him the run-around. The man wants to set his own price and will not provide a physical address so the check can be mailed to him. My mom contacted a Legal Aid service which advised her to pay with a check, obtain proof from the bank that the check has been cashed in the amount listed on the judgement, and take it to the court office as proof that the judgement has been paid. He is being very uncooperative and I don't understand why, my dad wants to pay. I can't see why the guy won't take the money and let my stepdad out of this noose.