27. A child or youthful offender shall not be received into a certified institute under this Act after the date of receipt by the managers of the institute of a notice of withdrawal of the certificate or after the date of a notice of resignation of the certificate: Provided that the obligation of the managers to teach, train, lodge, cloth and feed any child or youthful offender detained in the institute at the respective dates aforesaid shall, except so far as the Government otherwise directs, continue until the withdrawal or resignation of the certificate takes effect.