Turkish Airlines Wrong Date Change Fee Refund

I purchased a Turkish Airlines ticket for the Belgrade–Antalya route with PNR code UU3QV3 and wanted to change my flight date to 2 January 2027. However, due to confusion in the mobile application interface, I mistakenly changed the ticket to 2 December 2026 instead of 2 January 2027 and paid an additional fee of ₺143 for this change. Under normal circumstances, I could have changed my ticket to 2 January 2027 with the same additional fee. I noticed the mistake on the same day, 17 August, and tried to contact you immediately, without even 1 hour passing after the wrong transaction. First, I reached out via WhatsApp, but the system redirected me to the general ticket change screen, where an additional fee of around ₺2,500 was shown for the change. I am also attaching the WhatsApp correspondence in which my PNR code, flight details and ticket number clearly appear. After that, I called your customer service by phone. Although I waited for about 8 minutes, the call was terminated by the system due to high call volume before I could reach an agent. Since I am currently abroad, I saw that this phone call was reflected on my Vodafone bill as a rather high cost, so it is not possible for me to call you again by phone. My call history showing my attempts to reach you is also attached. I could not find a direct e-mail address or an alternative communication channel on your website, which is why I am submitting my request in this way. I would like to underline once again that I reported the incorrect change within less than an hour. My primary request is that my ticket, which was mistakenly changed to 2 December 2026, be changed to the flight on 2 January 2027 at the same time. If a change to the same-time flight on 2 January 2027 is not possible, I kindly ask that you inform me of alternative dates and flights that I can change to under the same or similar additional fee conditions as the initial change of ₺143, so that I can make my choice among the suitable options. Since I am abroad, I cannot call you again. If it is possible for you to call me, I kindly request that you contact me by phone due to the urgency of the matter; if not, I ask you to respond by e‑mail. I am sharing the relevant information and documents regarding the ticket and the transaction as an attachment, and I can provide my phone number for a call-back if required.