1) Go to YouTube
2) Click on your YouTubes avatar and click YouTuber setting. It will look like a gear symbol.
3) Under overview go down to "additional features" and click "view additional features"
4)Under "account status" you should see the word "copyright" with a light indicator to the left.
5) See if they indicator is green
6) Just to check further click the grey question mark right next to " copyright "
7) It should pop up a window saying " View all current copy right claims on your videos here" The "here should be blue, You want to click that.
8)It will bring you to a page with all copy right notices
9) If you do not see any take a screen shot of the screen as well as the indicator from set 4 and send it back to the person.
10) If that person does not reply send a ticket into freedom but wait 1-2 days before doing so.
Ask them what are the specific copy right claims are and on what videos. Basically, ask them to explain what they are talking about them they refer to "copy right claims" on your channel.
You're uploading footage of football matches, footage which does not belong to you. Seeing as you are not allowed to use such videos, they are correct in telling you that you must delete them if you want to continue as a partner of their network.
Most video games you are allowed to, but it is best to check the developer's website. Some allow you to upload but not monetise, others don't allow either.