Huh.
I'm sorry to hear of your bad experience with them.
I've been buying Dakota for about 6 or 7 years now and haven't had ANY kind of issues like that. In fact the last pair I had I wore for almost a full two years. I had to replace the insole after a while but that's what happens when you walk on them ALL day.
I work at a plant that treats wood with CCA, Penta and Creosote. They also withstood cement splashing on them last summer.
I think you should bring them back and try another pair.
Either way I hope you have better luck with your next pair of boots.