Auto repair service near Vestal, NY

I had my truck undercoated in 2012 at the Binghamton NY store. Every year went back for the inspections to what I was told to keep the warranty going. Every year I complained about the undercoating coming off before the end of winter especially the frame. Finally, 2018 they decided my frame needed to be scraped and undercoating reapplied then in 2019 again but this time they charged me to do it as the undercoating was coming off again. Last week I got home with truck looked out window and noticed truck was sitting funny went under truck and frame between cab and box was so rusted the frame broke on both sides. I took my trust into the salesmen at the shop that their product was protecting my truck unfortunately it was an expensive mistake. So far I'm being told there is no warranty on my undercoating.They have since blocked me from their facebook page don't answer emails or phone calls pretty rotten way to do buisness.