Won't process purchase

Attempted to purchase order on evening of May 4th. Page would freeze each time I would click on option to proceed to checkout.

Attempted every few hours through Tuesday evening when I finally found a number contact customer service. They attempted to process my order from their end with the same results. Tech said he had to transfer it to the site managers and I should be contacted within 24 hours. That time was up on the afternoon of May 7th. I still have not heard from them; and I still cannot process the order from my computer.