I have been a long time follower of this forum but created my account first time today to help you all.
I was in a similar situation. After waiting for 7 months and no response, I re-sent my photos and a letter explaining the situation to the same office (IRCC-Winnipeg PR landing photos). And voila, next day my PR card application got approved and after 3 days got my PR card in hand!
Surprisingly the card came from the Nova scotia office and has the photo that I sent last week (not the original one).
So go ahead and resend your photos to the same office where you sent originally and remind them that its been more than 6 months!
My guess is that they lost our applications/photos due to the Covid situation.