Mojo, email them. They will most likely tell you to give it another week or two, and then if you still don't have your tickets, they'll put you on a list at the show. So you won't have physical tickets, but you'll still get in. (Just make sure to
print the email they send you confirming that your name will be at the door/gates; my experience with the ilovemetric crew has been that they are not always the most organized, your disappearing tickets being further evidence of that.

)