B-1, r. 3.1 - Code of Professional Conduct of Lawyers
49. A lawyer must cease to act for a client, except where a tribunal orders otherwise:
(1) if the client revokes his mandate;
(2) if, notwithstanding the lawyer’s advice, the client or a representative of the client persists in contravening a legal provision or in inciting the lawyer to do so;
(3) if the lawyer determines that he does not have the competence required to continue to perform the mandate; or
(4) if the client persists in exercising a recourse or filing proceedings that the lawyer considers abusive.