Issue with Flying with My Pet on Turkish Airlines Flights

I have been flying with my pet for 2-3 years. I always preferred double seats (with legroom). I have never flown in a standard triple seat. In my last 3 flights, I have been experiencing problems. When I book a double seat for my cat, the system does not accept it. However, at the airport, it gets approved, and my cat can fly with me in the double seat.
I have had about 10-15 rounds of feedback exchanges with THY through their feedback form, and they only send me the rules. As someone who has been flying with my cat for 2-3 years, I already know the rules. There is no solution. Despite our correspondence, my cat flew with me in the double seat, and I even sent a visual proof. Yet, the response I received was: 'We would like to inform you that passengers who purchase the right to carry pets through online channels are required to sit in a standard window seat.'
Where in the pet transport rules does it say that pets can only fly in standard seats? Moreover, if such a new system has started, why do I face issues when booking tickets online, but get approval at the airport and my cat can fly with me in a non-standard double seat? Additionally, I asked the airport staff during my 3 round trips if the system had changed and why the system does not approve when I select a double seat for my cat. All the staff said they were unaware of any such change. And yet, I get approval and fly with my cat.
If there is a rule as written to me in the system (which there is no such sentence in the rules), how can the airport staff approve it? I have written to the THY feedback form multiple times, but there is never a solution. If I want to fly with my cat, do I have to fly in a triple seat?
Why can't I use my right to purchase the seat I am entitled to when flying with my cat? I know my animal rights and my own rights, and I will pursue all my rights in this matter.
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