Last Friday, I wanted to reroute a flight reservation calling the KLM hotline in the Netherlands. They could add the new flight to my reservation, but because "the costing department was closed already" (Friday 3 pm), they could not tell me how much the change would cost (50 EUR + fare difference). I will have to go to the airport and ask for the change and pay before to check in.

Today the same happened, this time not a rerouting but a flight earlier on the same connection. I had booked class E, and only class Q was available. They could again not tell me the fare difference, I have to call back on Monday.

How is it possible that they can not tell me how much the fare difference is if we can get it through the internet? You can just calculate it out of the prices on their website or otherwise, without calculation, from sites like expertflyer. Is there really someone at costing manually calculating the new fares???

Furthermore this kind of customer service really sucks. On top of the connection price for the phone call, where they keep you on hold for 15 minutes figuring out how to make the change, I have to call back one more time, or worst case, just go to the airport and find out that maybe the fare difference is too high to make the change...