+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
You can use google hangout or skype to call CIC
 
Skype is a good way. I think 1800 numbers are free without a plan but you could also get a cheap monthly subscription if not (for about 3 dollars)
 
You need a Canadian phone number to do so.

You'll need to try a VOIP service or similar.

Can you please explain VOIP service and how to get it?
Also, what is the contact number of IRCC? I shall be grateful for the help.
 
You can use google hangout or skype to call CIC

Can you please provide contact number of IRCC?
I tried these numbers from hangout but could not make through. +16139444000 and +18882422100
What can be done else please help me out :(
 
Those are the number. You need to call from a Canadian number or else your call will be rejected.