Dog died at the groomer

My husband dropped out 3 year old English bulldog off at petco in CT at 1:30pm for her bath appointment. She been there multiple times. He arrived at petco at around 2:30ish . Figured they should be finishing up, It never takes longer than 45 mins. He walked back into the grooming area. No one was back there, took 5 mins until a female employee walked back and asked me what dog he was waiting for. He told her I’m here to pick up Lilo. she then informed him that there was an incident and they rushed her to the shore line vet in and “that’s all i can tell you.” He witnessed blood on the first table behind the computer in the grooming area. He rushed out and drove to the vet…. He received a call from the vet 2 mins later saying that they don’t have a pulse and they will stop compression in 2 mins. 4 mins later the vet called me and said they stopped compression and the dog passed. The vet informed him that it was possible that the dog went into cardiac arrest due to the blower being in her face… The GM from petco wished to talk to us and said that after the bath, they were trying to dry the dog and she became very irritable when the dryer was put in her face , and give her a break to cut her nails and then they said the dog collapsed…. They asked him to sign a paper saying that Petco was covering the cost of the autopsy and the cremation…. So many things went wrong in this whole scenario!!! 

My family is heart broken. She was fine and in perfect health. How can a routine bath go so bad????

Corporate called me saying he doing an investigation, but I don’t know if that’s enough. What should I do?