Also file a complaint with the Better Business Bureau. I'm not sure it would get you results but it's another burr under their saddle.
If your local TV station has a "consumer reporter" who would do a story, I guarantee Coke would take notice.
For little or nothing you could file a claim in small claims court. If they don't show, you win. Of course collecting is another story, but a court order would give you some leverage.
PA has a little known law that allows you to request the state to shut down all in state business, for an out of state company, if they don't answer a court judgment in a certain time frame.
Don't mail them a bomb.
