Couple things...
First, you should know that in CA, its illegal to record someone without informing them that they are being recorded. Not button your balls, just trying to help.
Second, Kiesels website clearly states they have a ten day return/refund policy which is here :
https://www.kieselguitars.com/mbg.php. As far as I could tell (didn't comb through the entire thing) there is absolutely no mention about special provisions for special runs or any type of sale being final. CA law has very specific civil code provisions regarding merchandise returns, you should look them up.
Third, I would not get an attorney (as someone else mentioned) over $600. No one will take it. I would take them to small claims court out of principal, personally. I'd be shocked if you didn't win compensatory as well as punitive damages.
All IMHOP of course.
FWIW, I've ordered from Tom Anderson and have nothing but fantastic things to say about them. Even changed things mid order. Super, super cool company to deal with and I don't know that you can find a better playing guitar.......
Good luck brother!