C&C Red Alert 3 Downloaded only for Windows yet I'm on Mac system?????

Hi,

I've just purchased C&C Red Alert 3 on my Mac mini through digital download. When Reading the details for the game it was downloadable and playable on a Mac system. I have just gone to download it on my Origin App and the game is stated **Only for Windows Systems**. I even searched on the EAI website for games on Mac systems and this game came up, and I know its playable on a Mac system. 

Can I either get a refund or have a solution for this ASAP?????????? 

Order Number: 17370005823

Many Thanks. Toby.