Stealing V-Bucks (Fortnite)

Hello, I would like to share my problem and ask for help. Today, as usual, I turned on the game and left the computer, came back in 30 minutes. During this time, 2 skins appeared on my account and 3500 V-bucks disappeared. At that time I was at home alone, so no one could buy them. And since I was not thrown out of my account, no one could log into it either. This is the third time the developers have written something vague and cannot solve this problem. Please help who knows or who had this.