National Institute Of Open Schooling — Duplicate marksheet not delivered and grievance not resolved

My name is Moinulhaqq Nurulamin Khudkhudiya. Due to spelling mistake at the end of NIOS, there was a misspelling in my name in NIOS marksheet of 12th. I submitted a copy of 10th marksheet and aadhaar card to make changes in the name and paid 150 service fee for the same on 17/08/2021 with reference no N[protected]. Which was resolved in starting of April. After resolution I requested for a duplicate marksheet and paid fee of 250 Rs for the same with reference no N[protected] on 08/04/2022 that shows as service request approved but I still have not received duplicate marksheet from NIOS. I have put the issue in grievance at http://grs.nios.ac.in/ but have not received any resolution from them yet. My grievance no is 5-[protected]. Also when I tried their toll free no[protected], the call is answered and recorded voice says that network is congested. I have been trying to get in touch with NIOS for more than a month but have not been able to do so yet. That's why I am writing a complaint here. My enrollment no is[protected].