This is the second time that I buy a flight ticket, but after a while my ticket is not OK and this causes big problems for me, for example, I have to cancel my appointments, buy a ticket at a much higher price, I have to travel the next day And go to the hotel again.For example, the day before yesterday, I got a ticket for the Cluj-Napoca to Eindhoven , which was canceled again at a bad time, and I was really annoyed and I had to buy the ticket at a cheaper price of 200 ,Euros.And they still did not return my money, you tell me what should I do?