Discovery Vitality EXPLOITATION

I booked a flight on Kulula and used my vitality discount since I am a member. The total flight cost without Vitality was R571 The total cost I paid as a Vitality member is R620. This is completely ridiculous where is the discovery vitality discount, I actually paid extra by being a Vitality member and YOU'RE ACTUALLY CHARGING ME R99 FOR A BOOKING FEE, the fee that is not visible when making the booking Discovery is portraying themselves as giving discount to their members whereas they are actually exploiting their member. This is not the first time this has happened. I am so mad.