Payment is due upon receipt of invoice. Failure to make timely payments may, upon notice, result in the firm's withdrawal as your attorney in this matter.In the disengagement letter, the lawyer should warn the client of applicable time limitations, deadlines, and uncompleted investigation or casework. An end of representation letter serves as a professional and ethical marker to indicate the end of a specific attorney-client relationship. Post-Withdrawal Obligations. An engagement letter is a formal agreement between a lawyer and client that outlines the scope and terms of the legal representation or services to be provided. In accordance with Local Rule. Withdrawal is permitted if the lawyer's services were misused in the past even if that would materially prejudice the client. Withdrawal is permitted if the lawyer's services were misused in the past even if that would materially prejudice the client. Clark, an attorney practicing primarily in Amity.