Have already played all 10 matches haven't violated the rules but haven't got the weapon skin? I played on a Samsung tab s4 that is not that old yet. What could it be?
Are you sure the promotion is still running?
As far as I know, the campaign no longer exists. (Also the Galaxy Skin promotion has not been available for 1 year.)
You may like to participate in the Galaxy Cup, there's a female version of the Galaxy to be won.
You have to wait a little