If you're positive you entered the right Minecraft username when you donated, you could wait a bit longer, especially since Minecraft.net is having trouble right now. Or, you could ask sp614x directly.
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"Sometimes, I just wanna give up, say 'I'm done with this mess' and go to bed. But you know what; you can't shrug off your responsibilities. You got to pull yourself up and meet the challenges head on. That's the only way you're gonna get ahead in life."