So You Can't Even Exchange them to other currencies... What They do about it?
This is a hard situation for a country and the citizen. This means the poverty level there will be very very high and GDP will be low because production will be far from the people. The people there will have a bad time to life there. I think if the government is not corrupt, they can't apply for loan from the international groups they belong to start developing the country by investing in the sectors of the economy.
Lol

with what You invest? If the currency is all most worthless?
They need to Exchange currency to Foreign currency but who would take that?
Solution for them sell cheap Land Property goods from their Country to Foreign investors to get usa or eur forget about their own currency not sure If anyone want that currency maybe ill buy from them with extra cheap price about 5 usd for 5 pallets of stacked their currency
For them best Solution is to give their land resources or Property to get USA dollars or eur currency

That's only option I see here