Website Error - Discount ****

I am a Private Club Momentum Multiply member. One of Momentum's Multiply partners is Mango Airlines. I recently decided to make use of this 50% discount, as I worked very hard to obtain the Private Club status. I followed the correct steps booking my flight ticket, but also opened another tab in my browser to book my wife's airline ticket (on the same flight as mine). After making the payment for her flight, the confirmation came up telling me that we paid MY flight (with no discount received). I phoned Mango (TERRIBLE SERVICE), and logged the call with Momentum. I asked them to correct the issue by offering me my Multiply refund, which is almost R1000. After this Momentum confirmed that the issue was caused by Mango's website merging the sessions, causing the payment error. (Note that there is no warning or disclaimer warning you that this will happen when opening two sessions of the website). Mango Airlines did not even reply on the mails logged. They were also VERY rude when phoning their helpline. This is the last time I make use of Mango Airlines. I also will not recommend Momentum to anyone. If this is the way they treat their Private Club clients, do not expect any service or loyalty on a lower status of the product.