Attach a letter and tell CIC about your situation. As of now this is the best thing you can do.
To accommodate this stüpid FBI, I have been submitting one request every 5 month starting from last year, just to make sure I always have a fresh report with me...tons of money wasted.
I called CIC to get information about this but. I tried for couple of days many times but automated message says ""due to exceptional circumstances we are unable transfer your call to a call service agent"
Apply ASAP to FBI and send your documents with a tracking number. Put that tracking number in your letter to CIC explaining to them the time duration FBI takes. Maybe attach some info from FBI website which says the time it'll take to get it (I don't know if they show this anywhere, but worth a try).
I had applied for FBI report during FSW application (October), and I received it sometime in late Feb / early March! Write a nice letter with explanation, and you should be good. Nothing you can do in any case...