If your mortgage balance is higher than your property’s value, then you’re on the hook for paying off more than the original contracted mortgage amount.  When your mortgage reaches maturity, you’ll have to decide between
Paying off the excess balance with savings to renew to an affordable mortgage payment.
Refinance your mortgage into a new mortgage term with an extended amortization.
Realise payment shock to compensate for the bigger balance owing on your mortgage.
Sell your property with some profit.
You should take comfort in knowing that historically properties in Canada have always surged in value after a recession, and this is only a temporary setback due to the unprecedented rate hikes by the Bank of Canada to curb inflationary pressures.