Sterling Hospital — refund of extra sum paid in my bill not received

Address:

19A, Chandralok banglows, Ahmedabad, Gujarat, 382443

Ipn 1181756 son of dixit sondhra,
Final bill date 01.02.2019

As per sterling hospital mou with insurance company. Sterling will give a discount of 10%. And not charge the same to patient in the bill. And i was told it will be refunded after full settlement of bill by the insurance company. But after full settlement of bill and not after almost 3 months and approx 100 call's and communication. I have still not received the refund.