Check them.. I think this is a syndicate of Airlines scam. I was checking with Spirit Airlines phone Number on Bing.com where I saw this link:
https://spiritphonenumber.com/ and after checking it I saw that this website looks very bad but ads pretends if they are spirit. They also have a pic of Jet from Spirit on their banner. It feels suspecious after calling them, as its an Indian executive.. speaking good English and they charge over the actual price which Spirit offers on their website. But if you call them for any changes.. They will pretebd themselves to be a partner with Spirit Airlines.. I have a habit to ask bysiness name from executives on call but he said I am not authorised to reveal any such informations to anybody till business take place. When I listen to it, I got to know that it is a scam... This persom was soeaking in American Accent but his mouth tone was Indian n he said that they are based in Miami... I guarantee this is a scam, they do not even reveal their identities n in USA we have a law which gives us right to ask about information about business if we are into any telephonic business call n they are suppose to give all such relevant information to consumer, which these scammers do not bother to peovide.