Bring in the commando pest busters, inform the media and show Singapore society that the authorities are doing something and acting quickly. Then wait a few months when people complain on social media which cannot but also find its way to the ST, repeat the cycle calling in the exterminators again.
If you are not motivated to get to the bottom of the problem once and for all, just paying contractors to do this is also kinda of solving the problem.
So what's the problem?
It is when public servants are easily rattled and frightened by us. They are too hasty and not interested to do a fundamentally good job. Unless the PM looks into the matter nobody solves problem for long term and sustainable results.
Confident leadership is gradually turning into order takers and people pleasers. We are becoming like elsewhere.