Overcharging and misleading customers.

I received a 50% discount promo on Thursday. When doing my calculations I find that it's 30% discount and not 50%. When enquiring about it their support team tell me that it's a 50% discount with a maximum of R30 discount. How is that even...? They're misleading customers and overcharging them. This so wrong in every way. Imagine someone who wouldn't even bother calculating the discount because they're just happy to see that they have a discount promo. Bolt is overcharging and misleading customers.