If your extension was rejected or cancelled, you would now be out of status (as of March if it was cancelled or alternately as of the date of rejection) and beyond the restoration time frame if it was cancelled. Had you previously applied for an extension (Aug 2016 post) or did you have a new entry into Canada at that time? If you are out of status, and there is no option for restoration (90 day window to apply for restoration), you need to leave Canada as soon as practical. You need to follow up on your extension and find out whether it has been cancelled, rejected or approved and determine your actual status and options from there.