helping people based on the color of their skin and poor customer service

I have a one year six months old son and ever since he was born my friend introduced me to dischem and told she told me of how your prices are reasonable for babies, I have been loyal to your store since then. last month I was sent an SMS that I come and collect free pampers pack which I usually get but unfortunately, I lost my phone before collecting the voucher. so this Monday I went to do the grocery for my son at Dischem east gate centre and went to enquire about how can I retrieve the code so that collect the pampers, so whilst I was still waiting on the queue because there was one lady working and she was still assisting another customer two Indian ladies came and queued behind me, in less than a minute a lady who is also a cashier by the name of Sheshile Nkosi came to assist but instead of assisting me she assisted the Indian ladies that were behind me I was left astonished and very disappointed that she assists people based on the color of their skin and not helping the person who came first even her colleague saw my facial expression but because she was still busy she could not assist me and I had to wait, I am not sure if this is how you train your staff or if she undermined me . secondly, after my wait I then queried but I forgot the name of the other lady she took my details and told me that she will call pampers and give me feedback on Tuesday before 12 mid-day as I am writing this complaint I am still waiting for her call I am not even sure if she called pampers as she promised or if she threw my details to the trash can I am not happy with your service please get back to me