I've been in a similar situation to the original poster, except in my case the person accusing me followed through with the lawsuit. What I quickly learned was

I've been in a similar situation to the original poster, except in my case the person accusing me followed through with the lawsuit. What I quickly learned was that knowing I was right (and having evidence to back me up) was one thing, but that proving that in court is a whole other matter. Evidence only matters at trial and litigating can cost tens of thousands of dollars. My lawyer said we could try and recover legal costs but of course even if you win those back there is no guarantee you can collect. As far as I'm aware it's only large corporations with deep pockets who've ever sued over false DMCA requests. The average person doesn't have any recourse.