Root your Android phone to enable USB debugging (Developer Options USB Debugging) so that PC can tether to phone via USB. Change the official APN settings to another APN by the same network that does not implement tether block.
Basically, these are the tricks or hacks shared onlines by Three subscribers, I have no idea if it work or not to unblock the webe tethering limit: How to bypass webe hotspot internet tether block?.
