ABSA rewards and BIdvest car rental fooling the clients

I received an online quote from Bidvest car rental today for R2114 but remembered after that, that I could earn 10% cash back being an ABSA rewards member. I had to use a different link and was absolutely shocked to see that the quote is R776.58 more being a member of the rewards programme, for the same car and period, And what is even more interesting is that I get 50km's less per day to use, booking through that link. So ABSA, please explain to me where is the actual benefit??? You are fooling the ABSA clients!!! I wonder who is making the money???