All carriers in canada need to do is provide 30 days notice to change your plan as long as you are not on a tab.  If you login to self serve and look at your previouys PDF ebill (prior to the price change), look on the last page (look very carefully as it is small) and it should mentioned any plan price increase.

Callback times are horrible right now since Koodo had an outage last night and everyone is trying to get a callback.