@pachabhut yeah band 3 must be having 10MHz in your place, and since it's FDD, you're getting increased speed on upload, but since many people are using the network for downloading, your download speed is slower than your upload speed. Band 40 has the upload speed capped at 10Mbps, and for some reason, it's not aggregated.
You should also check if you're using any
VPN or
DNS changer app on your phone. You shouldn't see a key symbol in the notification area. The key symbol causes you to show double the speed.