Killer phone which only kill us. Review on Xiaomi Redmi 4A

Hii friends, I am using Xiaomi Redmi 4A for a year.When I bought this phone I think that phone give me very good performance but after 3 months phone starts irritating me.specially battery is very bad.In starting it give average battery backup but now it give only 4 hours battery backup on online internet use.And biggest problem is update, Xiaomi did not give me update after update role out for other devices.I get update after 8 months long period.But update create more problems than starting, now battery is almost losed.Phone does not give me backup.Now it give me only 1 hours battery backup.I also reported to the Xioami company, but he tells me that it is the average battery backup.Xiaomi did not replace my phone even in warranty is not expired.He told me that is not any problem you can read our terms and condition, which is clearly mentined that Xiaomi did not responsible for any fault if your area tempreature is not between 15degree celsius to 40 degree celsius.I am very disappointed with Xiaomi.