Changing money at a bad rate can add up to a lot. I've had the same experience but on a much smaller scale
It's not a fluctuation of exchange rate, I wish it was
The National Bank allowed tenge to drop, it was their action because they had no means to support tenge any more. So, the change of the rate is permanent. This means prices will go up. Income will not be adjusted because the economy is not that good now. Plus, felling of instability scares everyone. Tenge may continue dropping and it's very bad for business.