Lambton does not defer.
It's refund only.
So that's why I'm asking what is the deadline.
As now I have recieved reply-this is what they said-
Students who receive a visa rejection at any time remain eligible to apply for a refund of all prepaid tuition (less a $250 administrative fee and any non-refundable e-textbook costs).
Also be advised to refer to the second paragraph under Visa Denial section of our refund and withdrawal policy here –