A withdrawal is not effective until the Judge signs an order granting the withdrawal. Anytime up until that point an attorney may continue to, and I think some would say, an obligation to work the case.
Filing a motion to withdraw does not mean that the Court has granted the motion or that the Court will ever grant the motion. The attorney is in the case until the Court has signed the motion permitting the attorney to withdraw. There is no requirement that the attorney provide anything to you about being reinstated. If the attorney does not seek a hearing or does not arrange for the order to be signed, then the attorney is in the case.
An attorney has an obligation to continue to represent their client until the court allows them to withdraw. The court has to sign the order. The fact that the motion was not set for a hearing indicates that the client and the attorney had some difference of opinion as to how a portion of the case was proceed. Sometimes the difference is about payment of legal fees or failure to complete discovery in a timely manner.
Since the Motion to withdraw is between the client and his attorney the attorney has no obligation to provide you with a statement stating they are continuing to work on the case.