i am also on the same boat... with 458 score not OOPNP

and i have added my foreign exp. but HCL does not want to give a reference letter. i saved their email too for submission to CIC.
i absconded from HCL because i was met with a accident and was not going to office.
so for that foreign exp i am adding offer-letter, bank statements, colleagues letter project certificate and also LOE.