Try calling them early morning -- 7:30am-8:00am PT.Guys !! what is the right time to reach IRCC . I tried for one week and i was successful only once. For most of the calls after selecting the multiple options from the integrated voice i get 'We are currently experiencing high call volume and unable to transfer your call at this moment. You may hang up or try again later'
I have had success talking to them around this time. Your approx wait time will be 30 minutes..