Weekly Seasons - Advanced Purchase

There is a strange ATOC (Association of Train Operating Companies of which Greater Anglia is a member) ruling that says Weekly Season tickets cannot be purchased in advance - something you are able to do with other types of ticket.  However it seems that in certain cases staff can override this restriction.  Have you ever been refused such a ticket when trying to purchase one in advance?  Perhaps you could let us know please at info@eruf.org

Thanks.