i REALLY need help

So basically, I saved up points on Microsoft Rewards and realized it was cheaper to redeem them for a Microsoft gift card and buy Robux directly from there, rather than buying them straight from the store. And that's what I did. The only thing I didn’t pay attention to was that the Robux were for Xbox — a console I don’t own. Is there any way I can still get those Robux, or did I just lose them?