i never used skype calls and i am from argentina, how did you put the number?
Do you have Skype? If not, download it, then you have to buy credit using your credit card.
I bought the 3$ per month subscription for unlimited calls to Canada (I think it pays off, even if you call once). Use the phone option (the dial pad), choose Canada, that will automatically preset your country code to +1 and then put the rest of the numbers 6139444000.
Twice I got only silence, you have to keep trying. When the automated machine starts, choose your language, then press 1 for Immigration I think, just follow what they say, you will recognise it, at one point the machine will redirect your call to CIC, there I pressed 7 for Express entry, then 0 to speak to an agent.