YouTube Copyright Hassle - Unjust Claims on My Videos

I'm uploading videos to YouTube. I'm not making any money yet. I don't even have 1000 subscribers. It's not about the money. It's about copyright nonsense. It's really frustrating. I've added an intro to the beginning of my videos, using music from the "Youtube.com.com Royalty-Free Music SECTION" that I downloaded from there. The link is still available. I keep receiving copyright emails. I protest. This is royalty-free music. And I didn't get it from anywhere else but YouTube. I can't explain it. We're constantly at odds. https://www.youtube.com/watch?v=gywDGqGaoZQ&ab_channel=TelifsizM%C3%BCzik