Son got scammed

My 9 year old got scammed this morning. Someone using a YouTubers name asked to borrow a cheap unit for a video and said hell give him double back which he did. He did that a couple more times with slightly more expensive units and again giving double back to earn his trust. After that he then got my son to give him 2 ultimates, all his godlies and gems then blocked him and left. Luckily thanks to the awesome mean kitty running these giveaways I had a quantum to give him. That along side with my own units and buying/selling I managed to get him right again. Please everyone watch out for these types of scams as they earn your trust first