SunExpress SunEco+ Package Misleading Change Terms and €15 Refund Request

I purchased my ticket for my 04 November 2026 flight with code xq898 via the intermediary website Kiwi and then added this reservation to my SunExpress mobile application account with the reservation number. Since my ticket was non-flexible, I needed to change the date of my flight, and while checking the additional services in the application, I saw the SunEco+ package. In the description of the SunEco+ package in the SunExpress mobile application, it clearly stated that the reservation included one free change right up to 7 days before departure (plus any possible fare difference). Relying on this description solely to be able to change my ticket date, I purchased this package by paying 15 Euro. However, after buying the package, the system did not allow me in any way to change my ticket date through the mobile application. When I called SunExpress customer service, I was told that I could only carry out the change process through Kiwi, the intermediary website from which I bought the ticket, and that they could not process it themselves. I repeatedly emphasized that there was no warning or explanation in the mobile application stating that this change right could only be used through the intermediary site where I purchased the ticket, yet they said they could not assist me. As a result, the additional package I bought relying on the description in the SunExpress application turned out to be completely useless for me and I unnecessarily paid 15 Euro. I request that the package description in the SunExpress mobile application be revised so that it is clear and not misleading, and that the 15 Euro I paid due to this incorrect guidance be refunded to me. In addition, I request that my ticket date be changed from 04 November 2026 to 31 October 2026 without any extra charge, in accordance with the conditions stated in the package.