Rookie seller mistake

I sold one of my sons game consoles the buyer asked to return it. I stupidly gave them a refund as they had great feedback (stupid I realise now) the return postage was sent to them but they have refused to send the console back. Ebay have closed the return because I refunded the guy. I've contacted the buyer multiple times and he has now blocked me. I am so angry the money was to go towards my sons car repairs.