B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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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.
O.C. 129-2015, s. 49.