On a perusal of the billing details, I did notice that calls within Canada were classified as long distance and there were no means or alerts readily available to check whether we are within those limits prescribed under the respective plans. The only way is to log in and check the summary.
My understanding of the bill plan adopted is that calls made within the country fall under the $ 40 plan and International calls made pertains to the $ 20 category. But this is not the case in the airtime history. This would mean that the minutes/time spent would have to be reclassified and the tariff applied to the same. Requesting you to check on the airtime from May 27th till date and revert on the query.