Legal recourse w/ roofer hired by seller?

[Ali Groat]

I have a property in PA that I bought about a year ago. As part of the closing process, the seller replaced the roof entirely. The roof is now leaking in many spots. I just had someone take a look and they said the roofers were complete hacks: flashing done completely incorrectly, holes everywhere, tons of exposed nails, gutters filled with old shingles, etc. They said it looked like the roofers had never installed a roof before, and it's going to cost me a good chunk of change to fix it all. I'm not attempting to figure out if there was a warranty on the roof because I don't want the original roofers touching it again. I also don't want to delay getting it fixed since I have tenants in there and I don't want any water damage to start affecting them. I'm now trying to figure out if this is just an expensive lesson learned (I will never again let the seller make repairs), or if I have any legal recourse against the seller or the roofer they hired. Any thoughts? If numbers are helpful, the seller paid around $10k for the roof and I've been quoted about $2k for all the repairs.