I’m really, really irritated

Getting group notifications for a group I'm not a member of and have never heard of

The group is called Fantandein. I'd never heard of it before I began to get notifications for it. The group is invite only and the group owner says that there is no way I should be getting notifications unless I was a member, which I am not. I really just want to stop getting notifications for this group I have no interest in and don't even belong to. It's a very active group and is cluttering up my group notifications inbox badly.

Also, I have opted against seeing comment notifications for groups I am a member of, but the comments still keep flooding in.
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