Three months before my departure date Qatar Airways rescheduled the flight so that it left 4 hours later - but didn't inform me! So I only learned about it the day before, and consequently had to rebook my connecting flights at my destination with a penalty of €150!
Then the flight left almost 2 hours late and I missed my connecting flight in Doha, and had to wait 18 hours for the next flight! I arrived at my final destination 24 HOURS LATER!
I contacted the customer service and explained my case, but they not want to reimburse my €150 rebooking fee. Worse, they also refused to comply with the EU compensation rules for delays of more than 3 hours at final destination (€600), saying that contractually they are covered.
Besides the arrogance of the customer service department, I'm just surprised that Qatar Airways can call itself a 5-star airline. It's a joke.