Check if your listing is as per Google Places Quality guidelines especially the Title of the listing. Also, an incomplete address can cause issues. If you are using the Category feature, I would suggest try and pick from the options provided by Google in place of creating your own as this caused one of our listings to stay in pending state for a month. As soon as we changed to pre-populated category it got approved.
The new listing eventually listed, the old one at my previous address is still there but the account is deleted.
The problem is I am trying to get Maps to register my new listing to my website in organic searches. All my competitors have the tear drop under their sites. Funny thing is we are number one without a tear drop!