To change your billing cycle or pay in advance, please submit a ticket to billing department.
https://www.vpsux.com/clients/submitticket.php?step=2&deptid=1
Name: Your registered name (Account owner's name)
Email Address: Your registered email address (Account owner's email)
Subject: Billing Cycle / Advance Payment
Contents: (1) Your account ID or domain name (2) Billing cycle or payment amount in advance.