I'm sorry to hear about your rejection. The reason why you did not get assessment for number of points is because they rejected you based on not meeting the minimum requirement of one year of continuous work experience. They did not award you one continuous year of work experience, so you did not go through to selection factor.
I agree with Houra, contact them as soon as possible!!
This is not a hard thing to rectify such as job descriptions error. It's actually a blatant mistake from them. Send them the scanned copy of your IELTS score, quote stuff from OP6B to prove that you deserve 14 points for language.
I don't think you will need a lawyer for this, but to make sure you get their attention, send them by fax, by email and also by regular mail.
Also write ATTENTION FA01772 on your cover letter.