A shareholder of a company may revoke a proxy—
(a) by depositing an instrument in writing executed by him or her or by his or her attorney authorised in writing—
(i) at the registered office of the company at any time, up to and including the last business day preceding the day of the meeting, or any adjournment of that meeting, at which the proxy is to be used, or
(ii) with the chairperson of the meeting on the day of the meeting or any adjournment of that meeting; or
(b) in any other manner permitted by law.