I went to the CC pricing website and was checking out how much it would cost me in Canadian dollars to have various memberships in CC. When I went to click on pricing, the Canadian Dollar was not there!! I mean I know we have tanked lately against the USD, but hell I could have purchased it in Argentine Pesos, or Hong Kong Dollars.
I guess, I am not able to buy CC in Canadian Dollars.
I too am not sure why it is that Canadians don't have the option to pay in Canadian dollars and find this very frustrating. Specifically when we see that Adobe is addressing this for customers in other countries: https://blogs.adobe.com/conversations/2015/12/adobe-and-currency-fluctuations.html
In addition to posting on these community forums, take action and phone customer support, speak with a customer service person and ask them to put in a service request regarding adding CAD as an option and as for a support ticket.