I got scammed

So, a few months ago I got scammed. Didn't know it was a new thing for people to go go Fanfiction works and tell people they do artwork. Gave them money, saw the line art and thought this is shit. Im not paying for it colored. Never agreed and never replied back. I actually kind of forgot about them, never reopened discord because I have things to do. Then they messaged me again and said they'd threaten me with legal action. I feel like an idiot.