so curious thing just happened
if you're trying to get CIC on the phone, try using one of the non-permanent residence/sponsorship options like TRV if you're unable to get into the phone que to speak to someone. they may have shorter ques so you can at least get in the wait list to be transferred to an agent
i was in que on the phone and the lady that answered said that I had actually called the que for temporary residence so she transferred me to the correct department that handles sponsorship. though it did include quite a long wait
also just to share a bit of info for those who have already provided the medicals, SchedA, and PCC but are seeing "additional documents needed....check messages" in your CIC but are not as lucky to get on the phone with CIC:
I just got off the phone with CIC to check what those additional documents needed were and they agent confirmed, at least for my application, I can disregard he message and there is no other documents needed and attributed it to a glitch in the system