I am very sorry for your situation. Unfortunately, there is pretty much waste of your time to appeal. Your husband has been banned for 5 years, until then (2021), there is impossible for him to come to Canada.
A lot people don't understand that it is rarely accepted as a valid argument such as "I made an honest mistake" or "My lawyer made mistake". To the eyes of CIC, you, the applicant, who signed the forms, will be 100% responsible for all the information filled in your application. DON'T EVER LIE TO CIC, OR YOU SUFFER THE CONSEQUENCES.
Especially for those that had visa denial histories with USA, Japan, Australia, New Zealand, and England, those countries share immigration information with CIC.