They sent me an empty package and won't respond.

I literally received a package for 50 stickers that I ordered and my stickers WERE NOT INSIDE! The only thing in the package was a couple of their advertisement stickers. I have emailed multiple times in the app and on the pc website and have yet to receive ANY response whatsoever. This is unacceptable. Beware, when you have a problem, they seem unwilling to help.