ESSENTIAL information NOT AVAILABLE on eBucks flight booking page

Booked with FNB travel on an SAA flight specifically so I can take my firearm Got E-ticket which says SAA flight. What they FAILED TO TELL ME is that it’s a shared Mango flight (so can’t take FA) Nowhere on my E-ticket does it state Mango... Over 45min later talking to SAA, Mango and SAA again “sorry there is nothing we can do” How am I supposed to know it’s a shared flight when it doesn’t say anything. So now SAA want to charge me R4500 to change my flight to an SAA flight which I can’t afford, and it’s not even my fault. Basically I specifically took that flight and paid around R800 more than I would have, just to take my FA. Could have flown with Kulula for R1400 without my gun. Now I have no FA and I’m not happy about it. If something happens to me, I should sue. I never go anywhere without it. Absolutely ridiculous and handled very badly. No access to flight on eBucks website either so couldn’t even cancel if I wanted to???