In order to maintain industrial relations the employer is expected to reply to the charter of demands. If you do not reply to the charter of demands and where the Union submitting it is a registered union, if you do not reply to it, they will raise it as an industrial dispute and the conciliation officer will step in. ultimately, you will have to discuss the matter with the Union, and therefore, there is no sense in denying it or just keeping silent about the charter of demands.