If you don't have anyone in Canada, you are welcome to call long distance at 1-613-944-4000
Otherwise, for Question 10, I will just put the month and year;
Question 11 - Write "don't have it. Only copy of Canadian Immigration and Visa document"
No, my application didn't get return despite not having the above information.
Yes, month and year (as shown on the Citizenship Certificate) should be sufficient. That's what I'm using.
For question 11, the Sponsorship Guide (
http://www.cic.gc.ca/english/pdf/kits/guides/3900E.pdf), page 18, says the following "11.If you are a naturalized Canadian citizen and no longer have your Immigrant Visa and Record of Landing (IMM 1000) or Confirmation of Permanent Residence (IMM 5292), print the name you used at the time you became a permanent resident."
So for question 11, only enter the name you used when you became PR.