My opinion is you must make noises!! [Complain] ....otherwise no one is going to listen to you...3 times would be breaking rules I think, please check your travel insurance if have one,I don't know where you are flying from but there are strict rules in place for these kind of occurances, have they given any reason in writing by email etc? Later on I will check out their website for you... meantime please read your term and conditions.....I know it is frustrating and disappointing but let's see if we can find you a solution and get you flying..My flight has been cancelled 3 different times and I have no idea why!! It's absolutely so frustrating and I have to keep rebooking. I booked with KLM. Has this happened to anyone else?