It will not be considered duplicate content. However, you should use hreflang markup so that google knows that 2 versions of a page are actually the same (just translated) and show the correct language to searchers.

https://support.google.com/places/bin/answer.py?hl=en&answer=75569

If you try to verify your business listing by phone and it doesn't work, this could be for one of several reasons:

• You have an automated phone system or phone tree.

If you encountered any of the reasons above, please request the PIN to be sent to you by mail.

Whats odd is that you don't have postcard verification option. I recommend you post this problem on their local business forums at http://productforums.google.com/forum/#!forum/business

Good luck!

.com is king but if they are doing well with their .ca domain, I wouldn't mess with it.

Do they have the resources to manage two websites? Having a .com would help them rank in US better over a .ca - ideally the sites would be nearly identical (changing up small things like CAD vs USD, contact address/phone possibly, etc) and then linked up with hreflang markup.

Good question. I don't think it would make much of a difference since you aren't diluting the keyword value of the heading tag. However, you can always just make a CSS class that mimics your H1/H2 look identically.