Debt collector/Attny stole money through garnishment

I received notice of wage garnishment from an unknown debt, collector stated it was from 2002, refused more info. I've excellent payment history but amount was small & I was applying for mortgage at the same time. I paid him in full. After payment and "warrant of satisfaction" from him 3/15 my pay was garnished 6/15. I contacted him, he claimed he did not have the money and I should contact Sheriff's officer. Weeks later, my pay was still being garnished, my employer accepted my WOS as proof of payment and stopped. I contacted court officer's supervisor who stated they did not have my money and since judgement was in another county, I should call them. Took months of phone calls but I finally found out this collector did have my money, called him last month, he said he would return it. Post-judgement court also contacted him. He has not returned it. How can I recover and can I sue for damages? Garnishment now on my work record. Amount 177.00