hmm - very odd that information professionals of all people don't seem to have grasped the basics of how mailing lists work. Doesn't reflect well on a professional group dedicated to, err, electronic information management :-)
If you are upset by a temporary malfunction (which happens to most mailing lists at some time or another) might I suggest a trip to https://www.jiscmail.ac.uk/ where you can unsubscribe, and check the FAQs.