What legal options to I have to get a refund from a hospital for services that I did not use?

I paid a local hospital $880 for surgery in July, 2018, which I cancelled before the surgery date. I have called the hospital repeatedly to request the refund check since October of 2018. Each time, I am given the same song and dance - that it will be 2 to 3 weeks until I will receive the check. Yet, the check never comes and when I follow up with the hospital, they just say the same thing. When I called about 10 days ago, I requested that supervisor call me back. The customer service representative said that a supervisor would call within 24 to 48 hours. No one called me back. When I called today, I demanded to speak with a supervisor today. The supervisor gave me the same story - that their billing system would take 2 to 3 weeks even if she tried to expedite the payment, which she said she would do. I told her that everyone has told me the same thing without it happening and I had no idea why she thought I would believe her. Do I have any legal recourse?