Ripped off by Volkswagen Cherry Hill NJ

Volkswagen of Cherry Hill New Jersey charged me $5,000 to fix my car. That repair failed a few months later. I towed my car to them after the failure. It's still at the dealer 4 weeks later, they refuse to fix my car without more money.  They gave me an estimate for $6,600 to fix it again. What did I get for the first $5,000 - nothing. Just trying to dig out of Volkswagen debt.