Mcdonald's useless promotion

So I went to MCdonald's in Bruma today. Got in line at 10:30 when the promotion started. Heard about this on 94.7 saying first 500 Customers get the 20th birthday special. It was chaos, Got to the order booth at 12:30, (two hours later) and was asked for my coupon. Nowhere at Mcdonalds in the 2 hours was I told I need a coupon, or on the radio. Best part, people behind me had coupons, they arrived later than I did yet they still got coupons.How is it possible that they can arrive after me and have coupons? There were 2 black ladies giving out the so called coupons, the car right behind me had 2 black people in, I was white and accidentally didn't get a coupon? so is Mcdonald's a bunch of ******s? I then asked management how the car behind me can possibly have coupons and I don't? her reply was sorry I can't tell you how they got it, but without the coupon you need to pay normal price. You wasted 2 hours of my day, I will never support Mcdonald's again. To anyone reading rather go to Wimpy or KFC who can actually live up to their promotions.