Death Certificate

My brother passed away in a massive cardiac arrest in his sleep when he was on tour in Ooty. His tour-mate took him to the nearest hospital where he was declared 'dead'. The hospital issued the death certificate. We brought him back in his own city Kolkata within two days and did the cremation in Kolkata. As we live in Kolkata, a colleague of my brother has applied for his death certificate in Ooty Municipality with the death certificate from the hospital, the post mortem report and cremation certificate months ago. It's almost 3 months now, Ooty municipality has not issued his death certificate till date. Now my sister in law is in distress, facing so much difficulties in everywhere - be it bank, Daughter's school to office - everywhere... even the mobile company wants the death certificate to keep the number on. Since it usually takes maximum 7 days to issue a death certificate and here it's three month now and we haven't received it yet. Now the confusion arises - Which municipality will issue the death certificate? Kolkata or Ooty? In kolkata, it takes a single day. In worst case, it takes 7 days... We have no idea about Ooty municipality as they have no clear information in the website and nobody picks up the office landline phone. We are clueless. Please help.