I have heard this before. Nope I don't have the email. There was a time that WGT was trying to get people back playing and were sending out emails, to those that had not played in some time(don't know what time span was)
It was something along the same line as referring a player.
IIRC it was only 1 ball. I think a low level Cally.
OP probably got it, but doesn't know how to equip it.
Much ado about nothing.
And besides, maybe WGT looked at the wall posts and decided to give nothing.