A former teacher resigned from their CBSE school in Tamil Nadu without giving proper notice due to a family health emergency, initially communicating their resignation via WhatsApp. The school's Administrative Officer is now refusing to return original certificates, demanding three months' salary as per alleged CBSE norms. Experts advise that WhatsApp resignation may not be valid notice, but withholding certificates is illegal and amounts to extortion. The recommended course of action is to issue a legal notice demanding the return of certificates, and if that fails, to file a complaint with the Educational Tribunal.