Board Thread:Questions and Answers/@comment-10869965-20130615002906/@comment-5128181-20130702121013

You can only get 5 gift cards and 30 thank you letters a day. So it's not an issue. You could also restart your game and see if that helps? If not, you could contact Supercell on their forum; http://forum.supercell.net/forumdisplay.php/16-Bugs-Issues