Option 1

Call the client immediately to politely explain your vacation schedule, assure them of your commitment, and propose a plan for limited, scheduled check-ins or a temporary handover to a colleague.

Option 2

Inform your manager that the client's demands are excessive and interfering with your vacation, requesting that they intervene and handle the client directly until you return.

Option 3

Silence your phone and ignore the client's calls and emails until you return from your vacation, planning to address everything then.