Our writers and editors get permanent auto-notifications about approaching deadlines (12/6/2 hours before deadline) to which they must respond affirmatively. If we don't get response from the writer within some time, we assign backup writers to your project. In case, your primary writer fails to deliver your work on time, backup writer delivers it.
Normally, if something goes wrong, we try to contact our customers using any means available. Also, it's a good idea to set your deadline at least 6-12 hours ahead of your actual deadline. This prevents failure almost entirely.