Turkish Airlines Staff Incompetence and Indifference

Below is the complaint letter I sent to the company about Turkish Airlines. I submitted this complaint, and a few days later, they responded saying the complaint is not on my behalf and to send it with a power of attorney. I paid for this ticket,it's a shame.

I am O***, I bought this ticket, but my friend's daughter is flying. We arrived at Istanbul Airport after doing online check-in beforehand. We wanted to drop off our luggage at the E counter. Around 13:45, the lady at the normal entrance on the right side of the E counter did not let us in and directed us to the left side. The left side was crowded, and there was no staff or insufficient staff, so we went back and asked the same staff member again, and she persistently directed us to the left. This staff member at the entrance stated that she did not know the procedures done on the left side. The staff on the left side of the counter said they might not be able to give a tag for the hand luggage and would give it if they could find one. After that, we didn't listen to anyone and gave the luggage at the normal check-in area on the right. We managed to do our job, but it shouldn't have been like this. This is not a gift ticket; a lot of money is paid!
I wanted to complain over the phone, and the second person I spoke to on the phone said that everyone has their own job description and no one knows each other's job description. Then they said to file your complaint through the link.
While we were being dragged from here to there, who would be responsible if we missed the flight? Who would compensate for this?
First of all, I am complaining about the incompetence of the staff, but this is not the fault of the staff; the main fault lies with the management and upper management who created and should control this system. As a customer, I did my part, made the payments, but we had problems with the baggage drop-off and hand luggage procedures. If another company flew to this location, I wouldn't choose you, especially after seeing and experiencing these conditions, the indifference and incompetence of the staff.
At this point, I don't think the money paid for the ticket was fully deserved. While the system works this way, or while the management thinks it works, I don't think those in management deserve the salaries they receive.
Additionally, seat changes are made for operational reasons that are unclear. Is it being changed to give it to someone else? I don't understand. Then why do we choose seats? Just seat us wherever you want!
I kindly request that you take the necessary actions regarding my complaint and preferably get back to me by phone.
Best regards.