Did you check the last page of your previous bill to see if there was a rate increase?

Yes it is increased

That would explain your higher bill…. you should check page 3 etc of your previous PDF invoice, there should be a notice about the increase.

No there is no notice and the plan suddenly increases $5 each of my number

It would be in the fine print on the very last page, usually at the end of the bill before the increase.

 This is quoted from a Koodo page: 

Price increases are sometimes necessary so that Koodo can deliver better service and coverage. We always consider other alternatives first, such as adjusting costs or increasing efficiency, but sometimes a price increase is the best option for ensuring continued quality service.