QUOTE(goliath @ Feb 20 2012, 10:51 AM)
A quick question; is it true that all banks cannot block a particular unauthorised transaction which it has not been charged to your card yet but you have received a SMS from the bank?
It took a while for me to understand the situation.
The moment you were to receive an SMS, it means that a merchant has charged a transaction to your card but the transaction have yet to be posted to your account. A transaction will be completed once it has been posted to your account. Do note that not necessarily a transaction will be posted to your account as sometimes certain transactions occur due to other reasons such as "Pre-Authorization - Hotels charging your card as deposit". The actual (final) transactions that has been firmed and claimed by the merchant will appear in your statement and this is called posted transactions.
The purpose of the SMS is to act as an early warning system in the event the cardholder notice a transaction which is not made by the cardholder. The cardholder can then call the bank to proceed with a block. And later you may proceed with a transaction dispute if necessarily.
Banks (and I'm talking about about and MC & VISA issuing banks from anywhere in the world) will not block a transaction once it has been successfully approved by the system and this is the procedure as set by the governing body MC and VISA. Banks is able to "block" a transaction by denying the approval of the transaction - this is normally executed via a system that monitors such patterns. Example would be certain banks not allowing you to use your credit card for petrol for 3 swipes in a day. The 4th swipe is blocked from being approved.
The SMS system is not a confirmation that a transaction has been posted and confirmed to your card. It serve as a notification / early warning for transactions both authorized and unauthorized. Please take your time to understand the difference between transaction date and posted date. You will see HSBC is not unique ... all banks in Malaysia will have the same system and procedure. Go to a bank in Singapore, Thailand, Japan and the same procedure applies. Card cancellation in such scenario is a standard security measure - as the card number is permanently "blacklisted".
I think you do not understand how the whole system works thus your question above. How long have you been using a credit card? Don't confuse yourself unnecessarily and ask from the right person for the right answers. A trusted friend who does not work in the specific industry will not understand how the system works.
This post has been edited by hye: Feb 20 2012, 11:50 AM