Regardless of what Dish, their website, or the CSRs say- it's YOUR money. If I wanted the K model, I would make it clear up front, and tell them to put it on the work order. If the guy calls before arriving, repeat yourself. And when he shows up, insist upon seeing the K models FIRST, before ANY work is done. No Ks, cancel the job.
That said, I'm perfectly happy with my ViP722 DVRs.
That's fine to cancel the job. However, nobody can add 722k to a work order. It cannot be done. The technician can't control what product he receives and thus, you receive. Whether it's reman or new, again, the technician can't control this. I simply don't understand why it matters, other than some perceived problem that has been doctored up in the mind of the end user and, frankly, that sounds like your problem not mine. If you're blowing through receiver after receiver and continue to have problems, it's likely the problem lies somewhere else (electrical issues, lnbf, whatever) not that you got 4 "crappy reman receivers."
So please remember, if you're ordering or upgrading, don't harass the tech. If you don't want the equipment he has installed then cancel your order and make sure you verify that you're getting (or not getting) what you want before any work is started.
This is the reality of DISH. The faster you can accept it the better off everyone will be.