I suggest you to give them your card if they ask for it.
Firstly, by creating a din there on the spot, the schedule will be
delayed and there will be people like you who like to complain,
complaining about why the fares increase and the frequency
sucks.
Secondly, when you get your card back, you can apply for a
refund for the other card you used during the period you are not
with your own card.
Thirdly, it's transitlink's policy to do that, not SBS Transit,
althought Transitlink is partly co-owned by SBS Transit and SMRT.
The BCs only have the knowledge that if the console says invalid
card or similar, their duty is to confiscate it and issue a
'receipt' to you. Their responsibility is not to conform to your
nonsense.
Requesting you to give him your card is intimidating? Learn more
english before trying...
Think twice before posting..