BSNL has a well structured and multilayered Customer Grievances Redressal Mechanism including Customer Dispute Resolution Mechanism. For details Click here

•     Dial 198(From BSNL Numbers) /18004251500 (for booking through mobile from other service provider )
•     Register Online

If your requests / complaints / grievences related to BSNL Kerala are unattended, you may register it through the link shown below and you can get the status of already registered grievances through this.
Register Grievances       Status of grievances

Customers of Bharat Sanchar Nigam Limited in Kerala Circle can now voice their grievances and register in Grievance Cell working in the Chief General Manager's Office, Door Sanchar Bhavan, PMG Junction, Trivandrum-33 by dialing Tollfree number 12727.
The grievances to Secondary Switching Areas can register through Tollfree number 12728.

Additional option for Grievance Redressal Mechanism(Hindi Version)