Did you submit your tax file like NOA, T4 as well?
I didn't receive any confirmation letter.
My application is still in progress as I am under security screening now.
I was not asked for extra documents, but I submitted some supporting documents regarding my work experience, such as NOA, T4, emails through the webform.
Sorry for your experience. My security check started in August too and my BOWP was approved after 5 months. Have you tried to have them reconsider the BOWP if you believe it should be approved?