An Ecomm retailer contacted me as they created an account for me on their website without my consent

I purchased once on a website (as a guest) several weeks ago, and they just sent me another email telling me they had created an account for me without my consent. How illegal is this? (If it is / I am in Canada – BC and the company is registered in BC).

It’s a pretty small mom and pop shop I like so wouldn’t pursue anything more than asking them to delete it, but wondering 🙂

Thanks!