Sorry you are not happy with them, but I've had wonderful service, rapid shipping in all weather, and even free bonus items included in the packages. I will continue to order from them and encourage others to do so as well.
If your packing slip had a packer's name or number on it, why don't you contact management (not customer service) and let them know what happened, who was responsible for the packing, and that you do not plan to order from them again. I'm sure they would like to know about this incident in order to improve. They may even change your mind about ordering.
I'd send it as a formal letter, NOT email, with a copy of the packing slip, very business like and not critical. Just tell them you thought they would be interested.