Ajet Violated Passenger Rights - Denied Boarding and False Claims

On May 17th, I purchased a ticket from Ajet Airlines for a flight on May 30th at 13:00 from Sabiha Gökçen Airport to Pristina, Kosovo Since I planned to travel using my Serbian passport, I contacted Ajet customer service to confirm if my documents were sufficient. They advised me to consult the Kosovo Consulate, which informed me that my Serbian passport alone was sufficient. Based on this, I purchased my ticket. On May 29th, when online check-in opened, I was unable to complete it. I contacted Ajet five times and was told that no one could check in online, and all passengers needed to do so at the airport (even though three of my friends successfully checked in online). That evening, between 18:20 and 18:50, I went to Sabiha Gökçen Airport to resolve the issue. At the Ajet counter, a staff member asked if I had a Serbian ID, to which I replied no. After consulting with their supervisor and reviewing my passport, they completed my check-in, issued my boarding pass, and assured me there was no issue with my flight. On May 30th, I arrived at the airport 2.5 hours early. I confirmed with staff that my boarding pass was valid and passed ticket and passport control. However, at Gate 506A, boarding staff informed me that after my check-in was completed the previous evening, I had been removed from the flight in the system without notification. I was denied boarding as a result. I sought assistance and, while returning from customs, discovered that despite arriving early, I was falsely reported as having "missed the flight." A document with this incorrect claim was submitted to customs. I returned to the Ajet counter to address the issue with the visa and passport team. However: I received no notification of being removed from the flight, yet staff claimed I had been informed. They suggested the staff who checked me in may not have followed regulations and later removed me from the flight. The claim of missing the flight was dismissed as a system error. My request for a written explanation was denied; I was directed to customer service, which later informed me they could not provide such documentation. The Kosovo Consulate confirmed that there were no issues with my documents, stating that Ajet denied me boarding for their own reasons. This incident caused significant financial loss and emotional distress. I respectfully request a full refund, a clear written explanation, and compensation for my damages.