Unhappy customer

In July 2017, I was sold 2x Samsung J5 by an MTN telesales consultant. Upon collection of the devices, one was missing a SIM card tray. Which we returned as it was no use to me or my business. I have called and visited the Umhlanga branch, no less than 5 times - I have waited patiently and not wanting to create a scene, but I feel 8 months has now been long enough. My patience & sense of humor has come to an end. I would like the phone I have ordered and paid for. I am tired of being pushed from pillar to post with no positive outcome or feedback. I need your assistance Hello Peter this chapter needs to come to an end.