Booted my car after I paid $20 to park to go to Si...

Booted my car after I paid $20 to park to go to Sister Louisa's Ping Pong Emporium and left my car in the lot overnight. Was back to my car before noon and was booted. When I asked about refunding my parking fee, they told me they are a separate company. When asked about an eta on getting the boot removed, I was told that "it depended on how long it took the people before me to pay". I was alone, with my car in the lot and forced to pay in order to leave. If I had actually paid to park there, I'd totally understand.