Yep - you need a lawyer. When your wife received her visa she was asked whether she had any changes to her marital status and she didn't inform them that she had a spouse. That makes her spouse ineligible to be sponsored for Permanent status. She was supposed to notify Immigration Canada as soon as you were married and they would have added you to her original application and assessed your eligibility so that you could have come to Canada with her when her visa was issued. Even if she did not do this on purpose, there are plenty of people who don't declare family members that they think will affect their ability to come to Canada and then they try to bring them later on. Doing so is a complete violation of Immigration law and CIC has no tolerance for it.
Did you have a permanent resident application that was refused on this basis? Did your wife appeal the refusal? If so, you might want to try to find some other appeal cases on this
CanLII website by doing a search for "117(9)(d)". It might give you an idea of how often these refusals are overturned and under what circumstances.