Bro,
Walk in to PTPTN office.
Please bring the T&C saying that 1st calss will be exempted.
Bring supporting letter from University.
Bring all the certificate.
Please write a formal letter ( just in case they request)
PLEASE MEET THE MANAGER instead of normal staff
Because, Manager can do decision.
Im not saying normal staff is not helpful, but they have a limitation.
Good luck...

Ok, will try. Thanks, bro.

Edit: Fck lah, called my Uni ptptn branch, they said upgraded one cannot apply. Got letter also no use, because in my transcript it says 3.7 is first class.