Turkish Airlines Service Fee Notification After Purchase

Hello, on May 7th around 14:15, I purchased a ticket from your website that could be canceled within the last 12 hours with only a ₺490 deduction, and I confirmed this over the phone. I called you within the same timeframe and had the amounts verified. Now, you are saying that my refund will not be processed without a ₺900 service fee for the ticket I want to cancel. I receive a different answer each time. I bought the ticket considering the ₺490 deduction, and now you are asking for an additional service fee. How can you notify this change afterward? People make decisions based on this information. Moreover, while it was stated that there would be a ₺490 deduction for cancellation within the last 12 hours, no information was provided about the service fee. This action does not suit the reliability of your company. The rude response from Ms. N*** in customer service, saying 'we are not pocketing the money,' is also a sign of lack of understanding. I expect your assistance and a response that aligns with your corporate behavior. Please remember that no one earns money easily.