I am a professional musician, having been in international headlines at age 10 playing for Yo-Yo Ma, I grew up flying and having to buy a seat for my instrument: the cello. The last Spirit flight I took, I went by standard legal and Spirit protocol because in order to fly with my instrument you have to call any airline you decide to fly on, and speak to them over the phone in order to purchase the ticket for the cello and yourself.
I got to the airport on time, upon boarding a packed flight which quickly became delayed, Spirit attendants told me to go to the back of the plane and told me I may not be able to fly on this flight. I had to call my parents to find out if I could make other accommodations to be picked up from the airport in the arrival city, because with a $20,000 instrument that is basically the same size as myself, which weighs almost half my body weight, I can't exactly risk the security, weight, or transit provided by strangers (unless of course I lived right across the street from the arrival airport but that is nearly impossible no matter where in the world you live right?).
I paid full value for both seats. A customer was angry that his seat could not go all the way back. That is not listed as a reason in Sections 18.104.22.168 or 9.4 of their policies of carriage to deny me a flight. They offered to put it in overhead storage which is extremely unsafe -- forget about the instrument -- this poses a safety threat to anyone on the plane because if it had fallen out of the overhead compartment bin, it could have done major bodily damage.
Spirit Personnel ensured me I would receive a refund for the unused seat. I immediately spoke to them at the airport after arriving, and they continued to refuse it, or ignore that I was even standing in front of them. I called, emailed, etc. I will get my money back, I need your help, and refuse to fly them until I get my money back.