Can somebody explain why these people (their busin...

Can somebody explain why these people (their business office) won't call me back to confirm and take my order? I placed an order for well over $1,200 last Friday afternoon, having spoken to a knowledgeable guy named "Adam" about my needs. Over four days, I've sent multiple emails, three voicemails, and nobody calls back. I need to see the invoice; make a payment and get my order shipped ... and I can't reach anyone by phone nor by email. What gives??!! Is this company for real and just sloppy & understaffed .... or is it a more serious issue?