Attila: Game crashes after I hit start campaign, custom battle, or prologue.

DBKS2641

I have a mac and I wait a long time for the total war games to be released on mac because when I was younger I had a Pc and the first game Total war game I had was Rome, then I got both Medival games and so on, but now I am a broke college student. I have had this game for a year and I thought that the only reason it wasn't working was because I kept downloading it on a bad wifi connection but after 4 redownloads and 77min of it loading then crashing as soon as I hit a button, I have realized that the game doesn't work. I bought this off a steam and they have refused a refund due to 1. how many min. the game has been active even though I haven't actually played it yet, 2. the amount of time that has passed since I paid for the game. I love this brand but this faulty game has frustrated me and all I really want is the game to work.