1. Login to G-Suite Admin Console. Below are given URL.
URL: https://admin.google.com, type email address which have administrative privilege and click on NEXT button.
After that give password and now click on Sign in button.
2. Now click on Support > Contact support and choose available support Chat, Phone or Email. Below are given steps screenshot.
G-Suite Support Ref URL: https://gsuite.google.co.in/intl/en_in/support/