Surgery Cancelled While I Was Already Under Anesthesia. Hospital Not Returning My Prepayment.

I went in for a surgery that was partially covered by insurance and partially by a cash payment the hospital required before the procedure. When I woke up in recovery my surgeon advised me that they had not done the surgery because she had a concern once she started to cut into me. My surgeon hasn't communicated with me further and I have requested my paid in funds back over and over from the hospital. They aren't returning my calls and I'm not sure what recourse I have.
I need to have the surgery done still and can't afford to pay for it twice.
*Adding for more information, the reason she gave me was concern about secondary infection. This was for a medically necessary reconstructive surgery and it was scheduled to be several hours long. I'd been working with the surgeon for several months to prepare for this and had a huge amount of preop labs and scans, which all came back clear. It was 15k and this is a ton of money to just lose.
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