Raksha Health Insurance TPA — Harassment

My new born baby was adimitted in Jaswal children hospital on dated 13/05/2021.and discharge from hospital 26/05/2021.my member id is M58339777pnba .my baby is hospitisation since 23/06/21 .I sent theclaim document on dated 29/06/21.by speed post. But Raksha tpa mark objection of late submission of claim document. I attached the post hospitalisation bill. Till 23/06/2021.fifteen Day time for submission of claim document. Why tpa demanded late submission reason. I also send the Jaswal hospital registration certificate along with medical claim document. Tpa demanded registration certificate Again.i also attached late submission reason Letter as per Raksha tpa demand.please solve issue