My initial claim prepared by AirAdvisor was 1,550EUR, and eventually I was told the airline (i.e. KLM) had agreed to pay. So, I knew I was going to be paid 1,550EUR (-30%) as was prepared and posted by AirAdvisor. However, I was again informed that the airline paid only 600 EUR as compensation for flight cancellation. AirAdvisor was then asking me again for receipts (after more than one month) to follow up with KLM for additional payments. But that was too late for me to get the receipts. If AirAdvisor had asked for the receipts much earlier, I would have taken them and sent for refund. Even though I never understood why it was no longer 1550 EUR, I am happy that part of my complaint was attended to.