game.elements@gmail.com
I'm really sorry that this happened to you, but I can tell you that this is probably just an unintended side-effect in the donation process.
It's probably there to make sure you don't use the same code over and over again, but I guess it doesn't have a way of keeping track of whether you actually claimed your reward.
Please don't hold anything against the game because of your mistake, I can assure you that Zanz isn't trying to cheat you or put you down in any way.
Even better, if you can think of a solution to the problem, talk to him and maybe we can do something about it.