Anti-virus firm McAfee seems to be sending junk emails

I received a flood of renewal demands and unsubscribing doesn't work

I cancelled my McAfee anti-virus subscription earlier this year when I discovered it had been double charging me. It refunded only the current year and led me on a wild goose chase to recover the previous two years' money; I eventually gave up.

Now that my subscription period has ended, it is bombarding me with renewal demand emails several times a day. This weekend I received 15.