In the Video Manager, select Copyright Notices. Click on the link that says Includes copyrighted content then click on File a Dispute.
If it's not Epidemic Sound claiming your video, we cannot retract this claim even if it’s our song, but we'll do everything we can to help.
Please send us a screenshot of the claim to email@example.com and we'll contact the claimant and YouTube from our end.
Then, if you haven't already, you must dispute the claim. Add a link to the track in our library and state that you have a valid license from Epidemic Sound to use our music.
If they should continue the dispute (which they have no right to do) please refer them to firstname.lastname@example.org.