What do you mean “It is a company not a position.” Email should be from .ca address or BestbuyCanada not from .com or a support email. Best Buy Canada has its own HR website. Your email is fake.This is what he told me regarding lmia.
"Best buy is a company not a position. The position given to you in your appointment letter is LMIA approved. Your employee documents will be used for the processing of your work permit and visa"
https://bestbuycanada.wd3.myworkdayjobs.com/BestBuyCA_Career