Frustration with SAA booking and service

I have recently booked a flight for my 40th birthday to meet up with my friends in New York. I have tried countless times on the website to 1) include my frequent flyer number 2) book my seat 3) see what i can do to try and upgrade my ticket.

I have also called the call centre without luck.

I am so frustrated with the level of service encountered. I have flown and used other airlines recently and not encountered this level of frustration.

Please can someone assist to get this sorted out?