Why not you try and apply for excess shares
Currently you have 166 of LR, so you can apply for excess shares of 334 to make it a round figure of 500 shares altogether
For excess shares you need to pay 334 x 0.75 = RM 250.50

Last date and time for the sale of Provisional Allotments is NOT the last day for you rights submission & payment
You should be looking for Acceptance date, which is on 20th December. This is the cut off date to submit your LR payment

I'm not sure you can use TIIH online for your payment for LR. Can't seem to find any AirAsia rights in there.
However you can use Bursa Anywhere or manually - by applying banker's cheque and sending it by courier