Paying for not being informed

I booked a day before my trip and asked about payment options, i was advised of the eft or direct deposit 6hr option or payment with my card which i opted for paying with my card as that seemed convenient, i rechecked my schedule 10minutes later and learned that my leave wasn't for the date booked which i contacted the call center and they gave me an email to send my refund request to. No documentation or terms and conditions communicated to me but when i received my refund it was R200 less. The lady that was dealing with the matter responded with "Unfortunately all cancellations are charged 30%" , Who told me that?? I would probably not have made a fuss over a R200 but in this case I will as they made it seem like I'm ******** where they failed to communicate their procedures to me and not even a clarification or admitting to being at fault for not communicating this through. I will even waste more money just to get my point across by going to court for this as this legally cannot be right. People must stop undermining other people's intelligence.