Issues with Turkish Airlines Flight Cancellation and Ticket Change

Hello, my ticket number 2352208947676 was originally for a flight from Istanbul to Tel Aviv. My flight was canceled, and I changed it through the app to a flight to San Francisco without any additional charges. Today, December 23, I went to the gate to catch my flight. The plane was overbooked, and I volunteered to be bumped. I went to the denied boarding office. They told me I couldn't change my ticket because it was changed improperly and that they couldn't pay me the €600 compensation. The situation escalated to the point where the ticket sales manager contacted my workplace, asking for me by name, which is a violation of my privacy. Everyone at my workplace is now aware of the situation. The staff at the denied boarding office said they couldn't change my ticket because the ticket sales manager didn't approve it. I went to the ticket sales office, where there was a shift change, and they were discussing this issue in their WhatsApp groups. When I arrived at the ticket sales office, I spoke with the shift manager, Mr. O*** F**** K**, who examined my ticket and said the change was made without any charges. He mentioned that there might be a bug in the Turkish Airlines app. I even asked him to try changing another flight of mine from Nice to Istanbul on their website to see if it would work. He tried to change it and saw that it changed to Hanoi-Istanbul without any charges. I told him not to confirm the change, but he said he would take responsibility and could reverse the process if needed. When he proceeded, he saw that the ticket had indeed changed. Although the managers acknowledged my situation, my ticket wasn't changed, and I didn't receive any compensation. Currently, my ticket and even my account are under investigation. I wonder if the account of the ticket sales manager who made the improper change will also be investigated. If there's a bug in your system, am I responsible for it? I incurred many expenses, including visa fees and hotel costs, for my trip to San Francisco. According to SHGM regulations, such system errors are your responsibility. I want to make it clear that we will settle this in court, including the person who contacted my supervisor. You've ruined my day and violated my constitutional rights by hindering my travel. You have no right to victimize me due to flaws in your system. I understand that an internal investigation will be conducted regarding the ticket. I don't know how you will respond to me, but I will seek my rights in court. I spend all my hard-earned money on travel tickets. The ticket changed by the sales manager is attached.