Thank you so much
@aasaf for the info and glad that everything was done.
I think the contact number is 1-800-959-8281. It seems to me that 1-866-474-8272 is only for automated response not talking to the agent.
It's been so many days that I am trying to call them, but I couldn't connect due to end of tax season. That is why I think the second one only gives automated response.
Anyways, I finally managed to connect to an agent. He didn't have that much info. He just asked me my old and new sin and he mentioned that I call them back next year before filling my taxes. He didn't talk about PIN number or anything like that. He didn't have that many info about tax either. I may have to call them back.