I tell you a story...
Few days ago, I went to One U card centre again to redeem something.

My planning was, the TPs to be deducted from Card X then after that Card Y. As my TPs in Card X is more older than Card Y. But on that day, Card X is not with me. I only have Card Y, so I passed it to the CS, asked her to deduct the TPs from Card X, instead of Card Y..

Then she replied me that the system will deduct the older TPs first, then only to the newer TPs..

Mana tau, when I reached home and check... the TPs already deducted from Card Y!     

So, kesimpulannya...

1. Whatever card you pass to them, system will 1st deduct the TPs from it.
2. If the card has insufficient TPs, the system will only deduct the oldest TPs from other cards.
So for the banking TPs, let me try later after working. I will pass them the debit card, see how will the system detected it.

what did you redeem?