Terrible customer service

I bought dog food from dog.com a few times because their prices are a bit lower than competitors. BUT they inexplicably packed the 15-pound bag in styrofoam peanuts. This is not only unnecessary but bad for the environment, TOXIC if my dog eats one, and difficult to discard--a pain to pour into a garbage bag without spilling. I wrote to them once and they assured me they wouldn't do it again. They did. Then I wrote to them again and didn't even get a reply. Finally I called their 800 number and they told me they were required to do this by the U.S. Postal Service. I told them I've ordered from Petco, Pet Food Direct, doggiefood.com, and more, and none of the others used styrofoam peanuts. The response: "I mean, you could try to e-mail customer service and tell them..." What? YOU ARE customer service. "I did e-mail twice and didn't get a satisfying answer." So she repeated that they're required to use the peanuts, and I repeated that no one else uses the peanuts. Frustrated, I said, "Okay, thank you" and hung up. I will pay a few extra dollars to deal with a more responsible company.