I have had two recent occasions where I booked a Grab ride on the App, only to see the car is not moving toward me.
When I enquire from the driver I get either NO answer, OR a one word message like CANNOT.
In both these occasions it so happened I was under time pressure, having a flight to catch (the rides were both to airports, one in KL, one in Penang).
These nasty drivers then go silent - obviously waiting for ME to cancel, so they can keep their own record clean.

In both cases I reported the drivers to Grab.
I received compensatory payments, and promises to punish the drivers.

But this is happening a lot - to my wife also, and friends. Grab know this goes on, but they do nothing to stop it. If I cancel the booking they get off scott free and there is NO WAY to leave any review or complaint against the driver.

Grab needs to put a 'REVIEW DRIVER' button on the App which remains available to be accessed after cancelling a ride. Passengers should be able to register a complaint AND give a critical review of drivers who force a cancellation on a passenger but escape without any redress (unless the passenger makes the effort to write to Grab).

Fix this please!

The thing with complaints to them is no follow up by Grab side, whether they get punished or not is questionable.

I got case Grab driver didn't come to my pickup location but pressed pickup and went ahead my drop off location (like trying to scam a job completion), report to Grab say will punish but I dunno whether it happen or not also.

Does your compensatory comes in form of voucher code? Are you able to see any Apply button after entering the code?