TS, next time happen again, just play punk with them.
You can do a few thing:
1) Walk away despite them asking for your NRIC
2) Say u didnt bring and see what can they do to you
3) Ask them to show u their ID card, then u call back NEA to
verify their names, then u repeat step 1 or 2.
I have a friend who did option 1 and nothing happen to him. The
NEA officer jus LanLan.