BW doesn't treat anything, they get imported WC snakes and sell them off as fast as they can before they die. Their facility is probably where the snake picked up the mites as well.
OP before ordering another snake online read this first:
https://ball-pythons.net/forums/show...g-Herps-Online
I also hope you have access to a good exotic specialist vet close by, your snake is going to need it.