I Was just scammed for 20 dollars by an Redditor who was selling a fortnight skin card I wanted to gift my son.

A user by the name of u/AsparagusAny9609 made a post saying he had a rare skin and was willing to give it for a reasonable prize I messaged him saying I would love to but it from him and started negotiating we settled for 20 $. This was on 21st of June I had an accident on the 22 and was hospitalised I messaged to him on the 26th saying I was hospitalised and all and he tried to make me give me 40 $ which I declined then he asked me to use eneba and get him a xbox gift code for 20 $ I did that and said first can you share so I know it isn't a scam he said no first you share the code and I did then he blocked me and used the code without giving me the skin code. Please help me I dont any money left due to the accident and the last 20 $ I had left with me that I was going to use for my son I give to him so that I could gift my son this and I was scammed please help me I need help I dont have have anything left please bring me justice please.