I Was Unable To Change My Flight As I Wish Caused by the Termination of Agreement Between Anadolu Jet and Turkish Airlines

I purchased a ticket from Anadolu Jet, in cooperation with Turkish Airlines, for the Antalya-Istanbul flight on February 27. Due to a technical issue with the plane, my ticket was canceled. Since there were no other Anadolu Jet flights available that day, I had to buy a ticket from another airline by paying extra. I then changed my Anadolu Jet ticket to the April 6, 11:25 AM Sabiha Gokcen - Antalya flight. On March 21, my flight was first changed to 1:10 PM and then to 11:20 AM 1.5 hours later. During this time, I had purchased another connecting ticket suitable for the 1:10 PM flight. Now, when I want to change my ticket due to this change, I am told that their agreement has ended and I can either change it to Istanbul Airport or get a refund. But how does this concern me? I live in Kocaeli; if I wanted, I would have already bought a ticket for Istanbul Airport. I buy my ticket in advance because prices rise significantly during the holiday period, and I make a lot of adjustments and reservations according to the changed flight time. Now, I want to change the date of my ticket due to the flight time change. However, I am told that there is no right to change a ticket that has already been changed once. My flight was canceled, and I had to change this ticket at the airport; it wasn't a situation that changed at my request. Even if they refund my current ticket now, I bought it months ago for ₺614, and now tickets range between ₺2,000-₺6,000 due to the holiday period, and the refund amount does not cover my inconvenience in any way. When I spoke with the call center, I encountered a very unempathetic attitude. You are forcing people to choose the lesser of two evils. I request that my grievance be resolved and that I be contacted as soon as possible before April 6.