Friend referral falsely advertised

Discovery bank advertise incorrect information, I did the refer a friend campaign, I referred 7 friends and family after the capitec saga. When I had to claim the discovery miles that I qualify for they said they changed the policy last year November,however on the app the wording hasn't changed. I spoke to Beatrice who said she would transfer me to the team leader who spoke absolute ****. I have advised all my friends and family to cancel their subscription.