Absa Rewards not accepted - Consumer Complaint for Steers - Kathu

I went to Steers in Mogwase on 3 Feb to buy my son a Burger and pay with Absa Bank Rewards Voucher , however the cashier didn't know about it.She referred to the Manager who said that their system does not recognize Absa Bank Rewards Voucher . Please assist me before my Voucher expires.