AirSerbia is The Worst Airline Ever, Do Not Buy it

They canceled my flight and did not even refund me even though I called many times. It was the worst airline experience. Do not use Air Serbia at all. I would pay 100 bucks more just to not choose Air Serbia. I booked a flight on the 6th of September. They changed it to the 4th. They refused to give a new flight after the 5th of September. When I had no choice and canceled my whole trip and asked for a refund, they said they will refund me. However, now they are saying that I have to fill out some forms to get the refund, even though they told me that I will be refunded right away. Air Serbia is not an airline, it is a scam.