You have a cause of action to file suit against the short sale agent as well as file an ethical complaint.
The Realtor had a fiduciary and ethical duty to you to sell the property using their best efforts do act in your best interests. You have a cause of action against the Broker of the company. This situation may also include fraud.
“A broker has a fiduciary duty to its client. (Civ. Code, § 2079.24; Field, supra, 63 Cal.App.4th at p. 25 [“a broker's fiduciary duty to his client requires the highest good faith and undivided service and loyalty”].
The duties include but are not limited to the following:
This link sets out the definitions of the above duties http://realestate.about.com/od/realestatebasics/p/fiduciary_duty.htm
The elements required for a cause of action for breach of fiduciary duty in California are
1.A Fiduciary duty existed,
2.Breach of the fiduciary duty occurred,
3.The breach was the proximate cause of harm or damages.
Mosier v. Southern California Physicians Insurance Exchange (1998) 63 Cal.App.4th 1022, 1044.
This is a link to the California Bureau of Real Estate complaint process
It would be my pleasure to provide you with information to assist you in moving forward in this matter.