Dont take the words of the EPF as final .
Speak to the Management level as high as the DG.
A person signs the letter maybe out of ignorance ( thinking that EPF only for confirmed staff ) but that does not take his/her rights to EPF contributioin by an emaployer.
Go make a formal complaint as EPF is more than happy to get as much money contributed into their account and in doing so you get your account fatten by those lost EPF monies not paid by ur employer. GO FOR IT. ( DONT talkk to those ppl at the counters.)
YOU ARE NOT ALONE... :)