The client company, through its representative, must review and give feedbacks to the contractor after receiving the schedule update/report. It is not only an expected feedback and input mechanism but also a responsibility.
Return inputs (feedbacks) must be in a timely, coordinated, and agreed-to manner so nothing goes between the cracks. All inputs and feedbacks shall be in writing via e-mail or handwritten correspondences.
Address the comments from the client in a formal construction meeting or documented informally, prior to such meeting. Engaging face to face is preferred to a teleconference call or remote engagement whenever possible.