Just improved my WiFi signal from 60-80Mbps to over 500Mbps
He told me there is nothing he can do for me as Rogers is not responsible for wifi speed issues. As he was leaving, he told me 'if you have low storage space on your phone, that can be the reason why you are having speed issues.
I was kinda dumbfounded by this, really storage space? I still had about 4GB left. Anyways I backed up all my pictures and video from the phone, and then deleted them all from the device. And Just like that, I now have 500Mbps on wifi.