That's a shame. But I suppose at this point the damage has already been done, so pointing fingers and getting upset won't change much. I understand it isn't a good situation and you've definitely been screwed over and being told you're wrong about something that you aren't wrong about makes it even worse. But now all you can really do is hope for the best since you've already contacted your MP.
This makes me really glad we didn't decide to use an attorney though, we almost did until we were quoted $5000 just to fill out papers for us.