Sounds like a life learning experience.
I 've had a few myself.
I guess it's the only way you can look at it, plus you can look back and say you have character and integrity.
I think you should call the customer and tell them the aswipes wanted you to lie for them and you no longer work there because of it....maybe start your own comparny knowing what you know and become a direct competitor of those who gave you the shaft.....oh yeah, payback is great especially when it's legal.