got scammed from marketplace

Hi guys, I need your opinion, long story short, I paid deposit for a car on 23rd of August and I still haven't gotten the car. So basically on 23rd of August I went and checked out a Chrysler 300 which was going for a steal, I gave him a deposit of 500 aed and we decided we would go and register the car the next day. The next day arrived and he said we can't do it since he had sent it to a garage for a small repair and we could do it on Tuesday, then he said let's do it on Wednesday since his wife is busy that day.
Wednesday came and he said let's do it on Friday.

Friday came and he said car hasn't come back from the garage as he sent it for a service an replacement of few parts (I never asked him to replace any of it)
Then he kept telling me car is not back from the garage and on Wednesday he told me car came back from the garage but he can't sell it for the price he agreed for since the maintenance ( that I never asked for) costed him a lot and that he already has a buyer ready for a higher price and that he will give my deposit back. By this time I was desperate for this car and I ended up agreeing for a higher price with the seller and we agreed to do the ownership transfer on Thursday.

Thursday came and I asked him if it's all set and he told me the car is over heating and it's going back to the garage. He said he can sell me the car as is or take it the garage. I told him to take it to the garage and after Thursday for one full week he mostly ghosted me or said it's still at the garage and they are tryna figure out the issue and that the reason he didn't reply was because he left the phone in Dubai and travelled. He said we can't do the transfer on this week Wednesday but on Wednesday he said the garage still haven't fixed it.

Since then I have no update or response form him. I have called him a thousand times but no answer. I noticed that the fines on the car has been paid off and he completely deleted his Facebook account that had the ad for the car. And he also did mention that he's leaving the county. So I assume he already sold the car and left the country.

lam a student and 500 aed is a huge amount for me. lam very confused, upset and idk what to do about this. Do I just forget the money and move on or is there something I can do. All I have is his phone number and the mulkiya of the car. lam so upset because this was the money I made doing a part time job on my vacations.