Safeway Insurance TPA P Ltd - Settlement of claim of my medical insurance Safeway insurance tpa p ltd

I am a retired bank employee having medical insurance at Safeway tpa P Ltd ( National Insurance Co). Done Angiogram on **-**-**** at G. Kuppuswamy Naidu Memorial Hospital, Coimbatore which will not come under Safeway insurance tpa p ltd network. And discharged on **-**-****. I applied for reimbursement of claim for Rs. *****.** which was denied by Safeway insurance tpa p ltd. reson that the discharge was done by fraction of minutes before one day. They said admission in a hospotal for a minimum period of ** hours requires. But actually I was discharged one hour after ** hours. Request you to kindly settle my case at the earliest and reimburse the amount