No sim Tray No Phone

Good day <br> You see what happend i have upgrade to an samsung s6 edge plus at mtn branch at wonderpark at when we opend it the phone did not have a sim tray in so mtn said they must contacted samsung because it is out of box failer or something it is now 3 weeks that i am waiting for a response so must pay for my new phone but do not have a phone who fault is it samsung or mtn I say samsung because the box was still sealed so dissapointed in samsung