A). Register on SCORES / SMARTODR portal
   https://scores.sebi.gov.in/
   https://smartodr.in/login

B). Mandatory details for filing complaints on SCORES:
   i). Name
   ii). PAN
   iii). Address
   iv). Mobile Number
   v). Email ID

C). Benefits:
   i). Effective Communication
   ii). Speedy Redressal of the Grievances

You may also download the SEBI SCORES app to log a complaint

Android: https://play.google.com/store/search?q=scores+sebi&c=apps
iOS: https://apps.apple.com/us/app/sebiscores/id6478849917