Isn't left/right determined by how it's mounted on the rim? I'll have to take a closer look at my Toyo FZ-4's (which suck btw). But, I'm sure it's the exact same tire (ie. one part #), just mounted so the correct lettering is facing 'out', on the correct side of the car. Maybe these tires are different than the Potenza's?

And yes, that is sh!tty customer service. Sorry about your experience.