What Happens If I Break My Deal With The Prosecutor?
A plea bargain is a contract between the prosecutor and the defendant, and both parties are required to comply with the terms of their contract. If you have a plea bargain with the prosecutor and you are required to perform particular tasks (such as pleading guilty on a particular date, cooperating in the investigation of another offense, or testifying against a co-defendant), the prosecutor may revoke the plea bargain if you fail to satisfy your duties.
If the prosecutor breaks a deal with a defendant, the defendant may seek to have his plea set aside, or may seek a court order requiring the prosecutor to respect the plea bargain. This may happen if the prosecutor has agreed not to authorize additional criminal charges against the defendant in return for the guilty plea, yet subsequently files the charges.
As stated on expertlaw.com.