Irda — national insurance payment delayed

Address:	Surat, Gujarat, 395006
Website:	Google chrome

Sir i m in network hospital for cashless facility.
My hospital name is akshar surgical hospital.
I am waiting for my payment of 12 patient whose have taken treatment in my hospital before 14 month.
I had received claim settlement letter from md india tpa. Tpa said they r cleared from their side but payment is delayed by national insurance co. I had mail them many times but no response.
Give me guidance for further action.