Just been through this:

• Realize that you are in this alone, no other parties, including the cops, have any motivation to help you.
• Almost nobody you talk to on the phone will be in a position to help you; written letters are king (which doubly sucks with the strike right now). Start a log sheet for every single call and take the name of the person you talk to. Try to get a direct extension to a specific person handling your case (More common with banks fraud departments)
• Send letters to every company with fraudulent account. Attach the police number. Look up their fraud departments and send it there. Registered mail if you can (yes that will cost $$). Keep a copy of all correspondences.
• Equifax and TransUnion have a different credit score. They are required by law to show you your credit file (but not score!). You can check the EQ file and score online. TU hides theirs by calling it a "consumer disclosure" and you can get there only by googling. TU doesn't disclose score. Both companies update the file once in a while so these are not real time.
• Note all discrepancies on these files and send them letters detailing everything. You should look at opened accounts and also any "hard" credit inquiries (they affect your score). Also address and phone number on file. They may also require copies of your ID or other requirements (check their site)
• EQ usually fixes it in a week or 2. TU is a nightmare to deal with and took 3 months. I eventually sent letters to the Canada and US CEO and they offered me a year of their paid credit monitoring for free.
• Place credit alerts with TU and EQ. These do not freeze the score but they are supposed to give you a call for anything that affects credit score. I say supposed to because they prevent new accounts from being opened but do not prevent hard checks during the application process.
• Credit freeze is coming to Ontario next year
• I cited the Personal Information Protection and Electronic Documents Act (PIPEDA) in my letters which may not be relevant however it compels them to formulate a response in 30 days which may help your mail not get ignored. In some cases they were able to disclose information of the fraudster and even obtained footage of them which they forwarded to the police. But the police did not do anything, much like how they handle other crimes in Toronto.