Any person who has given consent can change her or his mind up to 21 days after giving such consent, but only if such revocation is in writing and delivered to the Director of Child and Family Services appointed under the Child and Family Services Act, or such designated official appointed by said director. after which, as soon as possible after receipt of such revocation, the Director must give notice to the prospective adoptive parent, who must return the child, whether or not the prospective adoptive parent has commenced court proceedings with respect to the child;