That sucks to be out that much money. Iv noticed from experience this is a popular tactic of many shady developers on various platforms. Some devs will intentionally leave some things broken that you may not notice right away, or drag out a task far past what it should take to get done. You really have to be careful and be very specific upfront about the details and check things top to bottom before you release payment if your using a platform with a escrow service, Fiverr gig sellers can be really bad about that kind of thing as well. Many are honest and genuinely want to see you satisfied but some will leave things broken or missing intentionally so you will need to keep hiring them for additional gigs as you continue to find things wrong. Another game to watch for is some template selling websites selling broken templates that absolutely cannot be installed by yourself or your own personal dev and require you to hire someone from THEY'RE OWN support team or support forum in order to get it working, I had a nightmare experience with appthemes playing that bs game, selling you a $50 theme that requires a $200 + minimum service afterward to set it up because its intentionally broken, cannot be properly installed by anyone else but them and they're hoping you dont know any better, you live and you learn.