shingles {roof} warranty~what should I do on blistered 2 yrs old roof?

Yesterday the roof guy came to check on my sun room roof for estimate and told me not good news which I was sooooo sick. I had my brand new shingles 2 years ago on November by roof guy to install on my house. It is 25 years warranty. The shingles were blisters already for 2 years old! What would u I do with the warranty in ur situation like this?
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