They are not a client.  They are another firm that has set us up as a user and shared their entire client QB access.

This isn't a user we set up on our end.  They set up the user on their end.  But now say they cannot delete the user.

I have sent them instructions to remove us.  But they say they cannot.

This is a major security issue regarding proprietary client information.  There must be a way to get the association between to firms deleted.