strange... although i dont know anything about prizes on bandamp considering i never got one and probably never will.... i have this to say.

If you cant get in contact with mud see PuppetXeno, he is a really active member and he knows the game around here.

I know that they got rid of prizes in battles for a while then introduced it again, i dont know the exact dates that this was but try to get in contact with the members who came second and first in that battle and ask them if they got their prizes and other appropriate questions.

You definitely deserve a prize for your song though... loved it! good luck with getting your prize