As David83 mentioned, it is not called transfer but redemption. Browse through to MBB's website for the process and you'll get all your answers to your questions. As for the duration, it can take between 1-2 weeks before the redemption appears in your Enrich statement.

It is not so much of a actual CL but it is more like a safety feature which the bank implemented to protect customers against petrol stations frauds which used to be rampant several years back. Each time you swipe/insert card into the machine at the petrol station, the card takes away a certain credit limit which is about RM200-RM250 depending on the bank.

This amount is then recalculated based on the actual claim by petrol station/actual usage by the customer and the surplus is returned back to your CL.

In the event of the error ... sometimes the machine already sent the transaction request to the bank although you did not pump anything. Likely hood of erroneous claim is low, so don't worry too much. Swipe too many times on a particular day and actually it would seem to the bank that you are pumping too much petrol for your own personal use thus the bank blocks further transaction for petrol.

Hope my explanation clears things.

To be more technically precise, use your online banking system to "advise" you on whether the CL has been released or not. CL will be released once the petrol station submits their actual cc claims. It is not necessarily 1-2 days as this is only true if the station submits their actual claim at the end of every business day but there are times when they submit a few days later.

Normally, petrol stations submit their claims at the end of every business day so that they can get paid by the bank within the next 3-4 days later.

Honestly, you need not worry about this too much unless you are using like 90%-95% of your CL already.