3. Can someone else file a grievance on my behalf? Posted on September 11, 2017 at 12:35 pm.Written by advantage_admin Appointment of Representative If a member wishes to appoint a representative to file a grievance, he/she must request a coverage or exception determination or an appeal on his/her behalf. Both the member and the appointee should fill out the corresponding form (or an equivalent written statement) and submit the request. You may call 1-888-620-1919 to file an appeal, Monday thru Sunday, from 8:00 am to 8:00 pm. TTY/TDD users may call 1-866-620-2520. You may also send a letter by mail to: Triple-S Advantage Department of Grievances and Appeals PO Box 11320 San Juan, PR 00922 (Form for Appointment of Representative) Post navigation 2. What is a grievance?1. What should I do if I am denied a drug or therapy and I disagree with this determination?