It is just a mistake and the webform was the right thin to do. They can take long time to answer, but it will be corrected eventually. I think it took around 4-5 week for me to receive and answer from them for some papers that I sent.
If a deadline is approaching's, try sending another webform and write in the first line something along the lines of "Deadline approaching, error in requested documents/biometric letter received from IRCC".
It is that or you gotta start using a wig from now on mate, sorry.
Cheers