Slow Network speed, supposed to be on a 5G network however only on 4G

I am located in Lenasia, I have logged a ticket my reference number is ***9. This incident was logged on the 09/12/2024 at around 10pm. My network speed is extremely slow, I am supposed to be on the 5G network however it has dropped to the 4G network. This morning at 9am I eventually managed to speak to a support agent who only advised me that I must reboot my router and place it next to a window, which I have done yet the problem still persists. I was informed that my call will be escalated to a senior technician and that they will call me in a few minutes. It is now 16:15 and no one has called me as yet. The problem still persists and there are many other people in my area that have the same issue and have been trying to call Rain but they have been unsuccessful.