Indian Overseas Bank — unnecessary delay in claim settlement

Card no: [protected]z
Employer : indian overseas bank
Roll no: 60216

This is to inform you that i have sent a cliam in the name of divya porwal for reimbursement. The claim papers were received by you on 11.12.2018. My claim settlement is taking too much time to get settled, i have called medsave's tollfree no. And got to know that my file is under investigation by doctors. It's been one month time and still the doctor's investigation is going on. Kindly update me why there is so much delay in my claim settlement and for how long this investigation will go on?
This is my humble request to you to kindly settle my claim at the earliest as it's been more than a month time period.