Star Health And Allied Insurance — unethical way of adding pre existing to policy even though it's not preexisting

Address: Pune, Maharashtra, 411057

Dear sir,

I the proposer of policy state that i had purchased senior citizen red carpet plan for my parents in 2014. At that time the only pre existing declared was hypertension and complications.in the year 2015 my father developed knee pain and within 6 months got knee replacement done upon doctor's recommendation. We did not utilize insurance and paid from pocket. Fast forward to year 2019, now the same knee developed infection, and required surgery and as operated in may 2019 and aug 2019.in may upon renewal, star health says that the issue related to knee was not declared in 2014 and this is pre existing and forcibly amended our policy upon renewal. This is unfair practice. How can we declare in 2014 for something that was due to happen in 2015?