I have never ordered from these guys before but was wondering if you have also tried contacting them through electrical-contractor.net?
Maybe they have a problem with email delivery at the other address.
It also looks that they use a lot of third parties for order fulfillment, so it may just take a while to get an answer.
Below is their order inquiry email. You could also try the phone number for billing questions. Maybe they can forward your call to someone that can help. Good luck with it.
For Order Inquiries Email
Billing Information Phone: 631-924-4800