Ok, good. Check wakelocks (insomnia) in safe mode too. Greenifying apps is just a temporary solution (sleeping pills), which may not always detect the issues.
Once the safe mode diagnosis is done, then i can guide further. It takes a bit effort, but its better than factory resetting the phone, which everybody suggests.
If wakelock stays even in safe mode, then your installed apps are working perfectly fine and its some system software, its settings, or bloatware related issue, that i will guide later.
Warranty starts right from the day of purchase when you use phone for the first time. Its 1 year from the date of purchase (date of first use). It has nothing to do with what's written on the warranty card!
Those are garbage. Refurbished with low quality parts!
Get a lumia 540 in ~11500/- brand new, its the latest price. VGA video recording though, but the still camera is better than any phone in this price.