What should I do??? Dropped off Dog for a Routine Haircut at my Petsmart, had to pick her up from hospital-?

I dropped my Cocker Spaniel ( Who Means everything to me) off to get her hair cut at the grooming facilities at our Petsmart store here in the city. I was called 3 hours later to be told that un unfortunate accident occurred and that my dog was Transferred across the hall to the Pet Hospital for stitches. They explained over the phone to me that while shaving the dogs head, she (licked) the clippers and lacerated her tongue. I proceeded to ask when I could come to get her and they said they would call--- they never called- about 3 hours later I call them and they explain that shes still unconcious, hooked up to a catheter and an IV. I leave immediately to arrive to all the higher ups consoling me, as at this point I am crying and very confused, knowing that somethings are not making sense. They hand me a plastic bag that has her leash and collar inside (soaking wet and ruined) they say "we accidentally "dropped" these in water) sorry". I ask to see my dog, they refuse as she was taking some time to "come out of it". Finally, I recieve her back, and shes playful, but very lethargic due to the drugs- The Doctor tells me for 10 days, twice a day she is to be on a strict soft food regimen, and is required to have her medicine twice a day- to have an entire day open for the appointment to remove the stitches. They told me they would all be calling me personally to see what the progress of the dog was over the next couple of days. The receptionist added "honestly, your taking this a lot worse than your dog is" and pointed out that the blood all over her jacket was that of my dog. They didnt charge me for the surgeries they performed or the groom that was HALF performed. They offered (but never gave me) a coupon for a free groom for next time. After returning home, I continued to observe my dog as she bled through her stitches, yelped and cried throughout the night. The following day, I heard not one word from Petsmart. None of the employees called to check like they said or anything, the only call that I recieved was from the receptionist at the hospital- she left a message. I still dont know the name of the actual person who groomed my dog. They told me "she was only scheduled until 5", as I stood there at 5:15pm. demanding to know what was really going on. So Now, I have written to Corporate and they write back saying it may take 3 to 5 days to hear back on their personal resolution, meanwhile Im working on keeping my dog as comfortable as possible. I have no idea how to handle this!! Please offer me your advice- what would you do??