From other website:

In absence of response/complaint not addressed to your satisfaction, you may lodge a complaint with SEBI at https://scores.sebi.gov.in or respective Exchanges at MSEI: https://www.msei.in/Investors/Introduction , BSE https://bsecrs.bseindia.com/ecomplaint/frmInvestorHome.aspx , NSE: https://investorhelpline.nseindia.com/NICEPLUS/ MCX: https://www.mcxindia.com/Investor-Services/grievances/register-e-complaint NCDEX: https://ncdex.com/grievances CDSL: https://www.cdslindia.com/Footer/grievances.aspx

From Communique:

In absence of response/ complaint not addressed to your satisfaction, you may lodge a complaint with CDSL at https://www.cdslindia.com/Footer/grievances.aspx or SEBI at https://scores.sebi.gov.in or with. Please quote your Complaint Ref No. while raising your complaint at SEBI SCORES/ Depository portal