The big, bad, die cutter company

How do you deal with bad customer service? Not just bad service, but horrible, terrible, awful customer service. Almost 3 weeks, several emails, 7 calls to California (including a 20 minute conversation JUST YESTERDAY) and still it's not resolved. I'm spitting nails, how can a huge multinational company stay in business with only 1 single employee dedicated to international customers, especially when that 1 employee appears to have no power, and no clue? I've heard 5 different stories, 5 different promises, and yet...

I feel like I should just give up. You know, once I get my money back that is.