<human>: I've been on Reddit a few years but don't post much and this is a pretty new account.

Back story: For a few years now I've had increasingly bad pain around the time of my period and it's come to a point where I have only about one week a month where I'm not in so much pain that I must take narcotics (at the advice of my doctor). I've seen several doctors and most thought a good candidate for the cause of the pain was endometriosis. I am a student and I got school health coverage. 

Shortly after, I called the insurance company to verify that the procedure would be covered. I additionally called the hospital and had them verify as best they could with my insurance company and also got a rough cost estimate with the knowledge that things could go horribly wrong and cost more. I was quoted $10,000 as an upper limit for a 4 hour surgery which would require some eradication of edrometrium cells growing in inappropriate places. The insurance company told me that 80% would be covered and the hospital agreed so I went in for surgery.

The surgeon ended up finding nothing at all out of the ordinary and only spent 2 (and not 4) hours in there. I am a small person so, in addition, the anesthetic was much less than normal. I was hoping for a smaller hospital bill to pay 80% of and glad I wasn't faced with years worth of battling a painful and potentially debilitating condition, though I am still in a great deal of unexplained pain.

So, I got the bill today and the insurance company plans to pay 0% of the cost -- $22,000 or more than twice what I was quoted. I obviously have nothing close to that and am furious and also frustrated. What can I do to get them to adhere to their word?

Can you summarize the given text in a few sentences?
<bot>: I got a bill for twice was I was quoted for a better-than-expected surgery which was supposed to be mostly covered and now isn't at all.