Unfair Business Etiquette - Not all customers treated fairly

Take alot had/has a promo running from the 1 August 2019 to 30 September where if you purchase using your Visa card you would receive a R200 voucher off your next purchase.

My colleague and I bought the Nuo Air Purifier on the 22 August 2019 about an hour apart, on the 28 August we both enquired about this voucher and got spinned that there are no more vouchers as they have reached their limit we must check the terms and conditions, we could not find the said terms and conditions because the link takes you to another page. However my colleague got a phone call from Pinkie as his query was deemed high priority I suppose to be escalated to management bare-in mind we had the exact same query, any way long story short he got an offered a voucher for inconvenience and yet I never received as much as a phone call. Take alot you say you strive on fairness to all customers? How is this fair?

Not a happy customer!