Thanks for letting us know. You will be able to reach to contact our Creator Support team once your channel is monetizing. In the mean time, would you mind sharing what the situation is so we can check it for you?
I'm also face demonetized issue for reused content, i never used any image,audio or video clip created by someone, i make animation video frame by frame, every single second in my video is created by me, but sadly i mistakenly demonetized and nobody try to help me @TeamYouTubepic.twitter.com/cblpgiZxXj