To cancel the power of attorney at any time - it is your right by law. Grounds for termination of the document is your desire, it is not necessary to argue. Not legally stipulated form of cancellation. It is advisable to do personally, having pre-receipt for authorised persons on receipt of a notification.
Contact the notary, who assured the attorney. Write an application in free form about the cancellation of an official document. It will state the date, time, reason for issuing the document, specify a period for which it was issued, to whom, under what circumstances, signature. Can ask the notary that he officially notified the Trustee about the cessation of his powers. Alternatively, use the services of mailby sending a registered letter with return notification, it shall present the request to return the power of attorney.
To cancel the power of attorney can be specific date or the date of the application for cancellation. It is your right. All actions of the authorized person shall be legally valid before the number from which the document on the abolition will take effect. When a person continues to engage in transactions or other actions on your behalf, without having the rights, you can safely go to court.
Convey the information about the cancellation of a power of attorney to the organizations that you "had addressed" the power of attorney. For example, if we are talking about a power of attorney to represent your interests in court, take in person or send by mail a copy of the application to the court. If you have given authorization for removal of the child, will inform about the cancellation of the document to the migration service.
Take the original power of attorney, if you can't do in person, send a notice to the authorised person by mail and asked to return the document.