Product missing when online order was delivered - ZERO feedback from the company

I ordered online from Absolute Pets. When my order arrived, a product was missing. I immediately emailed them to ask them to fix this. I have since emailed them four times in four days begging someone to at least respond to me. Nobody has bothered to even acknowledge my email. I phoned their customer care department and the consultant said that she would follow up on my behalf. I have still heard nothing. Shocking customer service. The least you can do is communicate with a customer who has had a bad experience and is giving you a chance to fix it. I WANT WHAT I ORDERED AND PAID FOR.