Should I File an Official Complaint About My Baby's Daycare?

I've been really upset at what's been going on at my daughter's daycare. But yesterday was the last straw. I had considered reporting the daycare to the city but had figured since my daughter is starting in a new daycare in two weeks, I wouldn't bother. I'm hoping you can help me out here. I had always liked the people (a husband and wife team with two helpers) who run the daycare, although they do have a bit of a brusque manner and do things their way. But then I started noticing that junk food was being served (cheese puffs, licorice, Dunkin Donuts, etc). I consoled myself that I would serve my daughter healthy dinners. But then one day I picked up my daughter and realized something was wrong with her arm. Come to find out she had dislocated her elbow. When I called the daycare as soon as I noticed the problem, they said they didn't know anything about it and were defensive, suggesting it happened after I left the daycare. I was upset but figured accidents happen. Then I saw the woman feeding Cheerios with milk to several children with the same bowl and spoon. I was shocked and it took me until the next day to ask her to please make sure Luna has her own spoon and bowl in the future (especially considering how sick she's been). At first she actually denied she did it! Then yesterday I brought her home and discovered she had a bite mark on her hand from another child. My husband called them and they said they didn't know anything about it. There were more defensive excuses. I'm beside myself. I understand that there will be accidents sometimes but to not know makes me think there's not adequate supervision. Should I report them? I realize that we're leaving soon enough (7 more days!) so why bother. But maybe it would help the children there now to report them. I'm confused. Help!