Medstream anesthesia sent my husband's account to ...

Medstream anesthesia sent my husband's account to collections without ever sending us a bill. When I contacted the collection agency they said it looks like medstream had the wrong address for you. I call medstream and they tell me there is nothing they can do since it is in the collection agency's hand now. Now we have to wait for this to come off his credit when it was their fault in the first place. Looks like this has happened to many of their customers if you look at the reviews. Horrible service