I originally booked with Spirit Airlines on 2-10-19 for a flight departing on 4-24-19. I allowed 3.5 hours for travel to the airport, but unfortunately was detained with gridlock traffic and arrived 5 minutes before takeoff. The ticket agent at the airport rescheduled a flight for me the following day. I returned home and became severely ill. I called that evening to cancel the flight, and the airline representative offered me a partial refund in the form of a future travel voucher. When I said that I did not have future travel plans and needed a refund on my credit card, he mentioned that I could get a full refund if I submitted a form along with a doctor's to validate a severe illness. He guided me through their website to the appropriate form. I did visit my doctor and she provided a letter which I forwarded to the airlines, but they are still offering a travel voucher, however now it is the full amount of $510. I am now undergoing further medical tests and following doctor's orders. Is there any way to get a refund?