Overcharged and misconception

Dear team, we booked two air tickets for our kids from Cape Town to Durban on [URL Removed] After selecting the flights and after we loaded their details we processed payment. The youngest child is 10years old and the eldest 12. When we visited the airline desk to arrange assistance they told us that we have to pay an extra R2702 because the flight we've booked and paid for is with another airline-Mango and they don't accomadate kids in their policy. How was it possible for us to know that. Never through the booking and payment process they stopped us to tell us about the policy<br> We were under the impression that we deal with SAA not <br> Mango<br> They've deliberately misled us and took an extra R2700 from very hard earned cash to pay for their systematical error on their website. As members of the public we are unaware of the arrangements between SAA and Mango. Please assist us urgently. We want to prevent this from happening to others because the lady at the counter told us it is happening very often but they did not correct their system. Conveniently they are misleading the public to make extra money which they don't deserve. Many thanks Derek Ref no 7R2W87 total R5512<br> 48 +R2832.4.