I have had a coupls of emails advertising carbon fibre face masks (yes, really!) for immediate delivery.
There really are some absolute shits out there.
Wish I could stop Millets sending me a daily email about their never ending warehouse clearance.....I don't know how they do it, I have tried unsubscribing and directing to the spam box and I still,wake up to the bloody thing every morning.
Assuming that you have an account with them, you may need to log in and check if there's something in the account Preferences section to disable marketing.
They are in breach of GDPR if they don't action your unsubscribe request, but some companies have found a grey area where they will continue to send marketing emails.
Usually you'll find that they've split their marketing options into multi-choice selections. e. g. Specials, end of season, news, weekend sales, new products, introductory sales, flash sales, etc.
You may be unsubscibing from one of those, but the others continue.
If that doesn't work then email them explaining that they are in breach of GDPR and if they don't desist then you will report them to the ICO.