There was an issue with the unsubscription system a while back which might mean you where not correctly unsubscribed. Can you try resubscribing and then unsubscribing a few times? That is normally all it takes for the system to catch up 😉
If you get in touch with the customer services team directly using the online contact form they can forcably remove the playlist link on your account. Sorry for the hassle!
If you get an automated email reply back directing you to the community or help pages, you need to reply directly to that email (even if its from no-reply) and one of the customer services agents will get back to you as soon as possible.