requires we use only comp shingles and comp look a like shake shingles.
During my younger ages shingling, a nail head showing and not under the over laping flap will leak. Nails tend to ease up and when that happens, the water will come in around the shank and guess what?????
Sounds like you need to do a Jay thing. This is take pictures, document, call BBB, and seek councel. This sounds like a shoddy job and one that you will only re do in several years or sooner.
Nails should not show and should be under the preceding flap.