Do you have ALL pages of your accepted offer including the Short Sale Addendum? Then check to see how many days you agreed to wait --- the standard was 45 days from the time your offer was accepted by the sellers. If shorter than 45 days, and that date has expired, did you submit an extension?
When you said the listing agent "accidentally" listed the property...is it now again "pending subject to lender approval"?
Please don't think the listing agent isn't doing his job. Chase is notoriously slow. Anything less than 3 months wait is short of a miracle. We had one that went on for 6 months. It's the luck of the draw as to whom you get as a set-up specialist (process the paperwork) and whom you have as the negotiator (the one who actually works with the investors to determine how much the investors are willing to accept in price, terms and conditions).
Ask your agent to continue communicating with the listing agent and find out if a BPO (broker's price opinion) was already done because that's a sign that the file is moving forward.
You should know what to expect in a short sale...if not, your agent should have prepared you as to what to expect. Please take time to read this http://activerain.com/blogsview/2432596/is-your-buyer-thinki