Google Product Forums
Re: Meta tags in double, actions done and no effect on GWT
Webmaster Tools :
OK I misunderstood. I thought you deleted the pages.
Why are you using multiple urls for the same page of content? Or if they are not same content pages why don't you use title and description meta tag that are appropriate for the pages?
If you don't want those pages indexed then instead of blocking them in robots.txt use a robots "noindex,follow" meta tag.