What to do if I heard some copyrighted music in a unrelated ad video as a backround tone?

The music is from a Kpop group Dreamcatcher - Piri. And the advertisement is Citi Custom Cash Card, 'Cash Back That Adapts to You'.

They just used the instrumental part of the music. I want Dreamcatcher to know that.

What to do if I heard some copyrighted music in a unrelated ad video as a backround tone?
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