With all the spam out there, the (three?) emails might have been trapped by their filters.  Unlikely all three but possible.  Did you try using the PRA form to get a return authorization number?  Or the toll free number on their site?  
With places I do business with, I'll try twice with email, and then the third attempt will be by phone.  Most of the time they have a reasonable explanation, if I even bother to mention anything.