First of all, this is a subreddit, not the support desk.
Second, nowhere does it say that the skin has to be paid in game. In fact, most skins through Prime were already in the game. They are just extra rewards if you have Prime. You knew that when you got it, and you also knew what the skin is like.
EDIT: Your posts are consistently getting removed by us because you refuse to read the rules. Please read the rules, or further removals might result in a ban.