National Tire & Battery [NTB]

I took my car for radiator and heating problem to NTB. The service was not performed to my satisfaction. I took NTB to small claims court in Lyndhurst, Ohio and got rewarded $ 350 plus $70 court cost and 5% interest per annum. NTB refused to pay. I wrote a letter to their headquarter in Florida, but got no response eithere. Then I went back to Lyndhurst court to garnish their bank account. The total amount per court paper be then was $459.38 That included the additional court filing. That did not result in any payment either.
I don't know where to go from here. I thought that the headquarter was TBC Corporation, 7111 Fairway Drive, Suite 201, Palm Beach Gardens, FL 33418.