Star Health is very notorious. You can definitely raise the case with their grievience redressal and go to district forum if necessary. Also if you feel that it is very tedious, better take a new policy. Even if you port to say, Niva Bupa, they will permenantly exclude some diseases while underwriting if the age is on the higher side. Also, other companies would be ok to underwrite the policy depending on the HbA1c level. DM me and I can explain in detail.