Inappropriate deceit faulty new electrical parts

Been to my auto electrician and was given the part as a sample. Got to centurion as I always purchase my parts at Kia centurion group. Bought a unit assy power window sub and was since informed the part does not reconcile on their system. The Kia parts consultant requested the vin number and I provided them with vin to my surprise they have not tested the part as a consumer have no idea why the part I provide has a number on which they could not pick up. secondly they have not tested the part before supplying me within a wrapper before I left I enquired this was not tested either of you don't trust me how do I trust you if you don't replace or refund electrical parts why you don't or have not made me sign any disclaimer as you stated on the contrary and not having tested afront of me before I purchased, how long do you have this in stock on your shelves? when I enquired with sample you said its old? Than vin number, do the part numbers correspond? and thirdly this is inappropriate deceit. Not asking you for a refund of the part is working, to and fro back to Kobus awaiting your response on the faulty electrical parts supp**** to date without having notified me nor any disclaimer signed of acknowledgement either beware Kia consumers