Turkish Airlines Passenger Seat Issue and Customer Service Response

On September 30th, I purchased tickets from the THY website for my wife Arzu O******* and my daughter Sidika Ze*** O******* for a flight departing from Istanbul Airport to Ordu Giresun Airport on November 14th at 09:10, with seats 3/a and 3/b, and a return flight on November 17th at 21:05 with seats 3D and 3/e. Later, we decided to change our return flight to November 18th at 21:05 and contacted the call center. The representative informed us that we could change the return flight for a fee, but our selected seats would be canceled. We agreed and later purchased seats 3D and 3/e again online for the new return flight. Despite making no changes to the outbound flight, the seats we had originally purchased (3/a and 3/b) were changed to middle seats in rows 13 and 16 by the check-in personnel. Despite my wife's insistence and the seat numbers listed on the email confirmation, they did not change the seats. My wife suffers from panic attacks, and I always purchase the frontmost seats for her comfort. Due to the error of the phone representative (if they had informed me that the outbound seats would also be affected, I would have paid any amount), my wife had to fly in a middle seat. On that day, due to weather conditions, the plane attempted to land multiple times but eventually landed at Samsun Carsamba Airport hours after take-off. My wife, avoiding the crowded buses, waited for the last bus and reached Giresun over three hours later with 15-20 other passengers. The next day, she fell ill and had to be hospitalized for four hours with an IV. I expected an apology from THY after my initial complaint, but the response was a ridiculous excuse. They requested a notarized power of attorney to defend the rights of my 35-year-old wife and 17-year-old daughter. Despite sending 2-3 more letters stating that I paid for the tickets and could defend their rights, I received the same automated response each time. It is truly disappointing and shameful that our country's largest brand is so indifferent to customer satisfaction. I condemn you for the distress we experienced. Ali O*** O*******