If one of the signers rejected the document, you will receive a notification on mail that he has rejected, including the reason why. If the reason is a short deadline, you can easily extend the deadline. If the reason is a disagreement, please reach out to them. If you manage to keep the same document and terms, you can unlock the document and send them again for signing. If there is a major disagreement, you will have to cancel and archive the document and start a new one. We are working on several features to negotiate and upload new versions of the document.