Star Health And Allied Insurance — rejection of cashless treatment

I am anup sangai. My group health insurance policy no of
Star health and allied insurance co ltd is p/900000/01/2017/000007. Claim intimation no. Cli/2018/900000/0260969.
Name of insurer is vrushalee anup sangai
She admitted in your network hospital, prestige nursing home near chhaoni masjid, nagpur, -13, for the treatment but star health insurance has denied the cashless treatment by saying that all previous hospitalisation details were not provided. But we have submitted all the details that we have from the date of dignosis of disease.