MRO office Shaikpet Family member certificate

I am an ex serviceman my father sri Kotagiri Srinivasa rao died on 27 September 2017, I applied for Family member certificate on 14 th October and the tehsildar office of Shaikpet mandal Hyderabad denied it saying that document about the pension is not there. My father retired as income tax officer and when I submitted the document from CPO confirming he is a pensioner he refused to accept it. The staff is not delivering the services as described in the citizen charter but find ways to delay or harass the public. I hope the CM office will redress my grievance