Something is wrong with the whole application. You were the one who sponsored him so you were supposed to be very involved in the process (more than your husband) and your signature was required many times. You should report the lawyer as well and add to your report about marriage of convenience that your signature was forged on sponsorship documents because you did not sign any. Unfortunately when you are sponsoring someone it is important to educate yourself because it is a huge financial commitment. It is very hard to undo so you need to be educated before you go through with the process. The new information about forged signatures may. help but this is going to be long process.
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigration-citizenship-representative/file-complaint-against-representative.html
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigration-citizenship-representative/file-complaint-against-representative.html