Star Health And Allied Insurance — mediclaim policy

Address: Nagpur, Maharashtra, 440002

My medical policy no is p/900000/01/2017/000057 and claimation no. Is cl/2018/900000/0427173 and operation is of solitary thyroid nodule the star insurance company is saying that they will pay preliminary amount of rs 20, 000, now the jain international organisation has not cleared this things with us and my policy is about 5 lacs so why i should co pay 50%. So please help me.
Thank you
Pankaj tapar