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Yesterday I was speaking with IRCC hotline. An agent told me he'll send a message to the secondary office to ask reasons of the delay.
How does it really works?
If you have passed the processing time they usually send a msg to the officer.
 
Every 2 weeks they add another two months. Can we do anything to complain about this? Where we can go? What organization does audit this department?
There's is nothing we can do about it. Let hope it won't be adding up again. Because technically H&C application is 24 months.