Ok another question, if TS don't mind me interjecting your thread LOL.

I am not sure if you all are aware of this or not.
When we use our CC at the CC machine at the pump, why does our card got charged RM200 for 8 days per transaction, then later after the 8 days have passed, Rm200 is credited back to our cc?

Example:

You fill in RM50 fuel for full tank.
Then you got charged RM200 for 8 days.

You fill in Rm5 fuel for motorbike also, kena charged RM200 for 8 days, then the credit released back.

Now my question is:

What's the main reason banks do this kind of faggotory?? 
Why not just the exact RM50  or RM5 for the fuel we fill in and no "temporary" charged for certain amount of days.

Can someone explain?

thanks.