In order to protect business users and to provide legal certainty for both sides, non-compliant terms and conditions should be null and void, that is, deemed to have never existed, with effects erga omnes and ex tunc. This should however only concern the specific provisions of the terms and conditions which are not compliant. The remaining provisions should remain valid and enforceable, in as far as they can be severed from the non-compliant provisions. Sudden changes to existing terms and conditions may significantly disrupt business users’ operations. In order to limit such negative effects on business users, and to discourage such behaviour, changes made in contravention of the obligation to provide a set notice period should therefore be null and void, that is, deemed to have never existed, with effects erga omnes and ex tunc.