Misleading Booking System

I made a flight booking on Kulula's website. By selecting ebucks I am transferred to eBucks Travel's website. Landing page states that I qualify for 30% discount. Need to mention that the flight directly on Kulula's page is cheaper than on the eBucks travel site. Throughout the booking the tab on the right indicates that the price displayed is before discount. I accepted that it will be deducted at the end. It never was. After phoning I was informed that the discount only apply to Kulula flights and not BA flights. No where is that mentioned. Everthing was showing KULULA, EBUCKS and DISCOUNT, except the confirmation page. Thanks FNB for misleading me.