iPhone 11 Pro Max battery health issue

Hi guys I’m from india

after facing an issues in my device I got an replacement iPhone 11 Pro Max in may 2020

so in may 2021 I updated to iOS 14.5 or 14.6 where the battery replacement program took place on the update . In the battery setting it showed that my battery is recalibrating . Before recalibrating my battery health was at 88% or 89% it took an week to calibrate and after calibrating the battery health was at 55%. My device was in warranty till end of may. As lockdown is going in India I was not able to visit apple service centre. the I raised an complaint to apple support they ran diagnostics test and they said it’s my fault. Days passed by my battery is in very bad condition it cannot withstand even an hour with 100% . In July the battery health is at 34% i feel so bad to use this iPhone . Again I raised an request they called me from apple support they said the battery is faulty etc.please give me an replacement of the device or the battery please anyone help me my battery drains so fast(I WILL ASLO INCLUDE SOME IMAGES)