Improper hurricane impact window installation caused extensive water damage to the interior walls and floors of my home. What should I do?

Improper hurricane impact window installation resulting in water damage to drywall and flooring. Windows and an installation contract were purchased from the Home Depot in 2017. I noticed a blister in the paint finish at the bottom of the living room while cleaning, directly below the window. When I broke the blister, I saw black drywall. A drywall contractor was hired through Home Advisor, who investigated and discovered wet drywall to interior walls and water settled between the moisture barrier and tile flooring, under laminate plank floors. He further noticed daylight from the interior of the room to outside (a separation at the bottom of the window frame and window). As he pulled the drywall off, the drywall crumbled in his hands and was wet. Walls throughout the living room and dining room were replaced. When he inspected the kitchen and family room, more water seepage and mold appeared in the drywall and instillation below windows in these rooms.