Regarding insurance claim rejection

i am the 2 years customer for starhealth comprehensive star health,recently i added my spouse..i applied for maternity claim..& request to insurer to reconsider the claim due to my family situation.but they rejected ,due to 24 months waiting period intimate through mail..afterthat i receiving mails from starhealth kindly submit the documents to proceed the claim,i did not consider that..recently i receiving a mail reason for rejection is non submission of documents(Even after reminders, you have not sent us the above documents.We therefore presume that you are not interested in preferring the claim and therefore the same is rejected.)one month back they rejected due to waiting period,now i receiving like this..i had documents submission ack copy..totally they are confusing. any possible to compensate against insurer or claim..kindly guide me.