IFFCO Tokio General Insurance — Rejection of health claims

Address:

Surat, Gujarat, 395007

This is to inform you that I am continuing my health insurance policy since last 15 years and this year when my father Surinder grover, met with an accident, they refused the reimbursement of the claim amount stating that the treating dr. Has mentioned that MR. Surinder grover was under alcohol abuse.
I have submitted a request with the company on the letter head of the treating dr. In which the dr. Clearly mentions that there was in no case any drug abuse and that he has not mentioned drug abuse in the reports. And that if a tick was made then it was a mistake.
I have sent an e mail requesting the company to take the case into consideration, but the grievance department has not replied since a month.
Kindly help me and guide me the steps that can be taken.