Plumbing issues in a new house, any recourse on my end?

We just bought our first house, about 4 months ago. We bought so that it would work out as a rental when we move in a couple years. It turns out that we bought the house after it had had a serious re- model and been completely replumbed, and all of it appears to have been done incorrectly. Joints are not glued together correctly, etc. do we have any recourse? How should we proceed. The plumbers who came out to figure out why there was a sewer smell in the house said that there was no way it was done by a licensed plumber. Thanks for any advice ahead of time!