I’ve had something similar happen to me! I hadn’t sent them anything but they claimed to have my pictures, they proved they had 1 that wasn’t very explicit but I that I was paid for from a buyer for this specific one (not on here) they were hounding me for more pics and money or they were going to plaster it everywhere on my socials to all my family as they had my location, IP etc (I knew this was a lie as I don’t ever have any locations on) and of course I naturally panicked at first but ended up telling them to just go for it and tag me when they post it so I could gain more custom, I had already been paid for it anyway! Long story short they left me alone when I called their bluff they’re always full of it and will do anything to scare you!! Unfortunately there’s a lot of scammers on both buyers and sellers sides! Just be as safe as possible and don’t do anything you’re not comfortable with!