I think There's no way they can control your usage for transactions etc. It sucks them doing this but there are also limitations on how much they can do.
Indeed, they can prohibit the involvement of cryptocurrency with the real world but they can not stop its use.
We dont really know the real reasons why bitcoin and cryptocurrency are being banned by a country's government. Lucky for those people whose government are accepting bitcoin and those who are considering on accepting bitcoon and the cryptocurrency. Maybe the government of the OP has doubts about the cryptocurrency and maybe they are still studying what benefits they can get if they accept the cryptocurrency to flourish in their country. But hopefully, they will realize the goodness the cryptocurrency can bring.