Help! Seller says he fixed the roof!

[Bret Burkett]

We just bought a house as our primary residence. The inspection report had a bunch of stuff on it including the flat portion of the roof needed some work and inside the attic it had some indications of water coming through. So among other things the seller agreed to fix that. Our executed contract says "repair flat area of the roof and any other areas that may not be insurable". 

You see where I'm going. Night three in the new house we wake up to water dripping on our floor! Anybody ever had something like this happen? What can we do or ask for? Do I have a leg to stand on? 

We have the invoice from the guy who did the "repair" and it was like $50. Roofer says we need a whole new roof. About $5k. 

At the moment the seller's realtor isn't responding. My plans are to find him through the appraisal district or other ways and try to contact him. 

Any advice would be great!