Sigh. Where the fuck do reps come up with this horseshit? Warranties are so fucking useless because they damn manufacturer ALWAYS weasels out of repairing anything.
Sounds like your seller installed a botched shock or damaged it installing it. My guess it the shock shaft got nicked during the install (or already was) or the shock was misaligned during the install and tweaked the shaft.
You couldn't hear a dump truck driving through a nitro glycerin plant!
Badasses might screw with another badass. Nobody screws with a nut job.