When you're checking the voltage, does whatever tool you're using have a Hz meter? It should be 60 Hz all the time, and that should NEVER fluctuate. In Texas, the PUC gets involved if that ever goes +-0.03 Hz for more than a few seconds. Not sure what Canada's rules are, but if that is fluctuating, then you have every right to yell loudly and rudely at your electric company.