Bombay Hospital — Security Deposit of Rs 5000 not yet received more, more than 1 year passed

Address:

Mumbai City, Maharashtra, 400001

Hernia Operation was done on May 18, 2016 but the hospital has not yet refunded as promised amount of Rs 5000 (Five Thousand)
The hospital phone is mostly unanswered and the marketing department says amount will be processed and SMS will be received about details, but we have not yet received the said amount.
The said operation was done through healthcare insurance (cashless facility)
Initially after period of 6 months, when I followed up with Bombay Hospital for the security deposit refund, they told me they are yet to receive the money from the insurance company.
But now its more than a year passed, and the hospital has not refunded amount of Rs 5000. We are working class people and cannot take unnecessary holidays to run to the hospital every time to follow up for the security deposit amount to be refunded to us, which hospital has promised to refund.