Originally Posted by gjmv
1) FB to upgrade but they told me that I have the wrong class - K instead of B. I dont remember seeing anything on the KLM/FB about upgrades being dependent on class but also, I had not choice when I booked online. I had to call KLM.
From the KLM webpage:
Upgrade from Economy Class to Business with Miles payment (only from a limited number of booking classes). While I agree that they should explicitly write that it is S and B only, I don't think that they can be accused of hiding this fact (which is btw pretty common for most carriers).
There have been recurring issues with KLM and AF being separate companies and this unfortunately leads to such problems. I'd always check whether there is D availability, before even considering a B-class fare.
Writing to the Customer Service (by snail mail or fax, not Email) of your home country might get you the difference K->B back, if you explain what has happened.