Why wasn’t my money withdrawn after buying Robux via Apple Pay?

Yesterday I purchased robux. I got it, but money wasn’t withdrawn. In other words, I got it for free.. How can I pay for it?

+I was about to get 400 rbx from Microsoft Rewards, but my country’s code isn’t supported so I couldn’t get it. I contacted Microsoft Support and they said they will try to fix with it.

So I think, maybe I got these robux for free as a refund for my Microsoft points lol

[Re-Titled by Moderator]