Unfortunately the banker made it difficult for you. GIC, just like other investment account can be cancelled anytime. The only complications that I know is cancelling retirement savings, that gave you credit during tax filing, like RRSP. Though you can cancel it, but CRA wil reassess your tax position.
I read on the terms of the GIC, it says you can cancel at no cost when after your arrival in Canada, but there is 14days that may be applied. You need to read terms of your GIC account. It shouldn't be different from the rest. If you decided that you can't stay here and want to go back home, be decisive and ask where is that specific requirement on the terms and condition, if possible put your request in writing.
PART D: Student GIC Program
- You may, at your option, choose to enroll in the Student GIC Program. If you do, you must transfer at least CAD$10,000 or the equivalent in the selected currency to us, of which CAD$8,000 will be invested in GICs and the remainder deposited into your Account (less any applicable fees). If you select the Student GIC Program option on the Online Platform, you may choose to close your Account after your arrival in Canada, at no cost to you.