Constant spam emails

I bought a washing machine from Hi Fi Corp in November with no problems (speedy service and delivery) but now 7 months later they have suddenly taken to bombarding me with junk emails at least 3 times a day. I never consented to my email address being used and have unsubscribed multiple times without any success. The advise I received when I called was "just mark the mails as spam so they can go to your spam folder" So be careful giving Hi Fi Corp any of your personal info.