When I am under debt review, will my outstanding debt keep growing?

In a sense, yes. When placed under debt review all your accounts are frozen and the terms of repayment are negotiated by your debt counsellor. While you will receive better terms and longer repayment for the most part, you will still have to make payments each month. Missing these payments will be treated in the same way as before debt review. You will still gain interest and have to pay monthly, but the terms of the payment will be better suited to your situation, and therefore be easier to pay back monthly while affording to live.