Sky doesn't understand "opting out" of marketing emails

When I opt out of marketing emails, I expect to stay opted out. This kind of crap sent from Sky really gets my goat.

Are you making the most of your Sky TV?
We’re checking our records and can see that you’re not currently opted in to get offers by email, so there are bound to be things you’re not hearing about, like:
-  exclusive money-saving offers on fantastic Sky products and services
-  the chance to trial our most popular products and services totally free
We’ll also donate £2 to Sky Rainforest Rescue, our partnership with WWF, for every customer that opts in – up to £10,000. Sky Rainforest Rescue is helping to save 1 billion trees in the Amazon. So you’ll be making a real difference to the rainforest, which is home to an astonishing one in 10 of all the wild species on Earth.
It only takes a minute, so opt in tod​ay and get more out of being a Sky customer.

Sky seem aghast that I'm not interested in a stream of marketing emails for products which I am probably not interested in. Which is why I opted out of having them. I don't want to be nagged about opting out - that's not honouring the opt out is it? In other words.. this is spam.

Just in case Sky ever ends up reading it, I will put it in terms that you might understand..