Airtel — airtel secure-the worst ever mobile protection insurance

I have been associated with airtel for about 5 years and last year i upgraded my postpaid plan which granted me a free benefit of airtel secure handset damage claim. During the registration process of airtel secure, i was informed by airtel's customer representative that claim can be lodged within 15 days of damage. (Their t&cs say it should be done within 48 hours from'discovery of damage'). There was a clear misrepresentation of facts made by airtel customer support team.
I damaged my device on 22nd june and because the damage mostly occurred on the back mirror (Which has a back cover put up), i was not able to detect it immediately. However, on 24th june i did see the damage and immediately tried to raise claim through the airtel application which by the way doesn't actually let you upload the documents. I again tried on the airtel website but the website also showed some technical difficulty. The next day (June 25), i call up at 121`and they tell me to drop a mail to [protected]@airtel.com with screenshots of the error which i did early in the morning and since then everyday i called airtel and mailed them with error screenshots. Finally on july 01, i mailed to [protected]@oneassist.in with my issue and they sent a link to upload documents which i duly did.
On july 04, airtel secure calls to inform that my claim no. 4353607 is rejected due to "delay in claim intimation."
When i told them that the delay happened because airtel website doesn't work, they said it was a different department and they have not received any proof from 121 about my daily mails or calls. Upon asking 121 to share my mails with airtel secure team, they say that they have shared all mails and i will not get my claim because i did not inform on time.
My claim has been rejected basis late intimation of claim.
I lodged the claim within 3 days of damage and any delay that did happen was because of airtel website not working.
Airtel as a brand, this is how they are cheating their customers:
1. Airtel in its t&cs mentions that claims can be made through app or website; but there app doesn't accept requests and their website doesn't work.
2. On booking, their representatives make false claims just to meet their targets and get customer upgraded on higher plans.