Vitality error on Khulula Website

I am a Discovery member and Vitality member on Diamond Status. One of the benefits as a Vitality member is that I receive a massive discount on flight with Kulula.com. Me and my son has exactly the same names. Khulula.com doesn't allow two persons with the same names to be used in the same flight booking. As all detail is electronically pulled from Discovery, Discovery needs to fix this error. For the last 2 years I have been struggling with Vitality to find a cure for this bug as it is so frustrating to book a flight just to be kicked out at the end by Khulula.com or to be told you have to book separate bookings. Separate bookings mean we struggle to sit next to each other in the plane. This has been reported previously with no result. I am not the only one with this issue. Discovery just doesn't care!