You have about two years to sue iirc as I had a similar problem in the 2010s and looked it up and I was just out of that time period. Shitty roofers abound, had similar problems with shingles Improperly added to a roof with a low slope angle, and badly weaved together where slopes met. The best but was they covered a big hole where a chimney used to be with just shingles so if anyone had stepped on the spot they would have fallen through.