I am in souther ontario and was told this is a perennial plant.
What are care instructions?
I'm pretty sure its a Campanula, probably Campanula Wonder White (also called White Wonder); as such, there's a paucity of information available with regard to hardiness. Usually, potted Campanulas sold in the houseplant section are not hardy outdoors unless you live somewhere with warm winters, and are sold as temporary visitors to display indoors.
If you want to try to grow it outside, it might survive or it might not. There's also a Campanula Wonder Blue; both seem to be versions of Campanula haylodgensis. There are care instructions in this link https://www.whiteflowerfarm.com/how-to-grow-campanula-white-wonder, but unfortunately, no image of the plant; an image of it can be found here http://www.bcf.com.tr/Cok-Yillik-Bitkiler/Campanula-x-haylodgensis-White-Wonder, though you will need to translate from Turkish to English if you want to read it.