Target and My Personal Information

I received an email apology from Target today. This is my reply:

Hello Gregg Steinhafel,

I do not remember ever using a credit or debit card at Target? I certainly did not provide this email address. Since I do not remember doing this, either I have not, or it has been a few months since I did use any plastic as a Target customer. I do not give out this email address.

Why are you hoarding my personal information?

Michael

I am sure Target’s email to me is sincere. What bothers me is why does Target have my information on file in the first place?  Does being a customer give a company the right to collect and hoard my personal information?