Is a construction contractor legally and financially responsible for unsatisfactory work?

I hired a contractor to replace some dry rotted floorboards on my front porch. However, the alleged repair job doesn't look any better than what was there before. The boards are still uneven and warped. I phoned him to express my dissatisfaction and expectation that he would make things right. He said since his company was an LLC so I couldn't sue him, and that he wasn't responsible since he did not actually do the work himself. He had a relative and another man do the job. I think he's full of bulls**t and trying to put one over. The contract said the boards would be "repaired" but his definition of "repaired" is apparently different form mine. He's got my money and it looks like he just painted over the old boards and hoped I wouldn't notice. What should I do?