Bit (or way) late to the party, but this will likely be my last post in the V4L forum. I just wanted to say that I sympathize with the OP, as this same exact thing has happened to me before on multiple occasions. I get an email containing a coupon code and an ad stating, "35% off x" or "40% off y", only to come to find that the discount received once I've applied said coupon code is less than what was advertised.
Was it an intentional slight? Or a glitch in the matrix? I honestly don't know or care, it's certainly annoying.