No Updates For Xiaomi Redmi Note 13pro+ For 2 Years

I am using a Xiaomi Redmi Note 13 Pro+ on the Dtac network in Thailand and my device has essentially never received proper software updates. The phone is still stuck on Android 14 with the original interface and no HyperOS 2 or 3, and there have been no security patches since November 2024. What makes this situation even more frustrating is that my relatives have exactly the same model on the same Dtac carrier, but their phones are already on Android 16 with HyperOS 3 and are receiving recent updates. This clearly shows that the problem is not with the model or the operator in general, but with the way my specific device is being handled in the update system. I have contacted Xiaomi, but I could not get any helpful information or solution, and Dtac simply replied that it is a device problem without offering any concrete support. As a result, I have been using a relatively new phone for almost two years without proper system and security updates, which creates both security risks and a poor user experience. I request that my phone be immediately included in the correct update track and that the latest available Android and HyperOS versions, along with up-to-date security patches, be delivered to my device without further delay. I also ask for a clear written explanation of why my device has been left out of updates while identical devices on the same carrier are fully updated.