If government shut down internet service even on fixed line connection then there will be complete internet blackout in the country and in that situation we cant use bitcoin.
I think this is also one of limitation of bitcoin that we need internet to use it.
I am sorry to hear about your struggle with having a reliable internet connection in Pakistan. Hopefully this is a not regular occurrence as limits your life considerably in the 21th century. It's true that internet is the main issue that leads to problems we can face when dealing with crypto currencies, but we should be aware that internet is being advanced and new ways are developed. The biggest game changer is going to be Starlink from Elon Musk which as already around 4000 satellites in orbit from the required 10,000 they need to cover the world. Once we can use the internet via the sky around the world and don't need internet cables or cell phone coverage, life will be much easier. Especially in remote areas where there is no cell phone coverage we will be able to finally use the internet without issue. In case you have regular internet issues you could contact Elon Musk via Twitter and ask him for help, maybe he can setup Starlink in your town like he did with Ukraine.