Black Friday MTN special

I bought a phone on contract 29 November 2017 as part of the black Friday promotion MTN had. As part of the promotion the phone was suppose to come with a 256 GB memory card to this day still have not received the memory card. It is so appalling because each time I go into the store I am advised that I can only be assisted by the consultant that assisted in signing me for the contract. I have contacted the call centre was advised to send an email to a complaints department which I did and to this day no response. I was advised to send an email to the store manager Calvin Maseko to this day no response. Been advised that people that the contract on the same day as me received their memory card ...I want MTN TO tell me when they promised fair customer service what they ment because I don't see any fairness in how my situation and their providing a service to me has been fair.