Product: Debt collection

I had an emergency XXXX last XXXX at XXXX XXXX XXXX in XXXX, MN. Payment from my insurance company ( XXXX ) was held up because XXXX had only sent anesthesiologist bills and not the bill for the actual XXXX. I was sent large bills but I knew they were incorrect as my insurance is a very good one. My insurance had to call the hospital to get them to send them the XXXX bill so they could process the claim. I was told by my insurance NOT to pay those bills and to wait for an accurate bill to be sent out. The correct total I owe ( according to my insurance company ) is {$150.00}. I'm more than happy and capable of paying that immediately but to date I have still yet to receive a correct bill from them. I've tried calling multiple times but they keep telling me I don't owe them anything! In spite of this, a collection agency keeps calling my cell phone and harrassing me. They have also sent a couple letters. One time I spoke with them I made it very clear that all I needed was an accurate bill from XXXX and I would pay it immediately. The collection agency was trying to collect over {$700.00} from me and I had to inform them it was only {$150.00}. I'm at a loss as to why XXXX would send a collection agency after me in the first place. The delay was caused initially because they didn't bill my insurance correctly and later because they didn't send me a correct bill showing what I truly owe them. I'm starting to wonder if this collection agency is even legitimate? I'm writing you now to complain because I saw 2 derogatory marks on my credit report from American Accounts AD and the original creditor is XXXX XXXX XXXX Nurse Anesthesiologists. and XXXX XXXX XXXX. I don't know what to do here. I have tried calling XXXX numerous times, hoping to get someone there to either send me an accurate bill or take my credit card over the phone to pay it. Neither happens because they say I don't owe anything. I could pay this collection agency but l question their legitimacy. I have had to correct them on the amount and told them that I wanted an accurate bill sent by XXXX but they only send me their ( American Accounts ) letter showing the amount they want to collect. How hard is it for XXXX to send me an accurate bill? I want these derogatory marks off my credit report. I've never had any and my credit is stellar. I'm not late on payments ever and XXXX should be ashamed of themselves handling their affairs in this manner for what amounts to a nice pair of shoes. Totally ridiculous. The attached documents show a few things. From the collection agency they have 2 charges that add up close to the amount I owe but one of them is XXXX  more than one in my possession. I'm guessing it is one of the ones in question but the total is different. The 2nd bill I sent is for XXXX but the assumed corresponding bill is for XXXX. Quite the difference, looks like a decimal point. The post it note on there is the person I've phone tagged with and who says I don't owe anything. You'll also note that both bills are the same address but differently named outfits. When I call the number on the bill I get sent to the hospital and they say I don't owe anything.