I really don't mean to be insulting, but this is clearly one of the most obvious scams ever. There is no escort involved, they just try to sucker as many people as possible into paying the first fee, and then continue trying to milk as much as possible from those gullible enough to fall for it. There is a 0% chance of getting any money back.
You say you have no experience in this industry, so here's my advice to you since you have already proven yourself to be susceptible to being scammed. Do not pay anything in advance for any escort. While some reputable escorts do require a deposit up front, you won't be able to tell the legitimate ones from the grand majority of ads posted by scammers. Do not go to any other site to choose an escort to see. There are some real escorts listed on other sites, but you somehow managed to find and engage a scammer on one of those other sites. Read some reviews here to find an escort who has already been positively reviewed and who doesn't require a deposit, and book them instead. Follow these directions and good luck!