Treating Customers Fairly

I made a Discovery Vitality Booking through Kulula. When the booking was concluded I realised that only 35% discount was app**** to the booking, the additional 15% was not app**** which is applicable when paying with a Discovery Card. <br> <br> I called the Kulula call centre only to be told SORRY YOU WILL NOT GET THE DISCOUNT YOU DID NOT TICK THE BOX even though you used a Discovery Card for the booking. This can't be FAIR, is this treating customers fairly? <br> <br> I am sure there's a validation that the system does when you select the Discovery Card option but paying with a non Discovery Card. But why is this not picked up when you pay with the Discovery Card but didn't select the Discovery Card option? Its cheating customers out of a Discount that they are entitle to. This is not treating customers fairly. I don't think taking loosing a discount of R617 only for not ticking a box is FAIR. <br> <br>