Called custom they said my parcel might be charged for tax. Have to pay additionally 40 plus to appoint pos laju as customs agent if want to collect from the post office without even knowing how much is the tax now. Or else go all the way to custom at klia to pay tax and pick up at the post office. It's like double the effort. Yeah bought some stuff online.

Thanks nik91 for your reply though

No I didn't go all the way to klia.
I appointed post laju.
I just emailed PMK - Cs Customsupervisor <pmk.cscustomsupervisor@pos.com.my> and attached the letter in the mail after filled in Section B and D.
It took few working days for after them to go through they will email you back CONFIRMATION ON CUSTOM DUTIES informing you the amount that you should pay.

It's much more convenient.
The downside is that you won't know how much are they charging you and you can't negotiate with them to lower down the duty charge. After receiving their mail with a document CONFIRMATION ON CUSTOM DUTIES. Just print it out bring your IC along go to the post laju office that they asked you to while collecting your parcel.

Post laju office that they kept my parcel is located so near to my place that I refused to pay for the special delivery charge. I collected it myself.
You can pay them to deliver your parcel to your address.

In my case
They charged
Duty Custom (6%x my item value)      XX
( Might be different case by case;
decided by custom)

fees for appointing post laju                30
EDI (SMK) Custom Form                      18
GST for the  [ 6% × (30+18)]                  2.88
TOTAL                                                  XXX. XX
P/S:
They responded quite promptly.
Make sure you check your JUNK box. Mails from them could just glbe treated as junk mail