Reliance Jio Infocomm — lyf wind 4 mobile

Its been an year that i have purchased this mobile and since then i am facing multiple issues.
1. The screen often gets blank for 2 to 3 mins while working and hangs.
2. The phone takes a lot more time to charge than the time specified by the company.
3. The charger as well as the phone very often heat up while charging and the phone heats while normal usage.
4. Despite having no application installed in the phone other than the ones that were preinstalled the phone very often hangs.
I have been making complaints from the month the phone was bought and visiting the service centre as asked by the online executives but the person in the service centre resets the phone to factory settings rather than a permanent resolution. The phone still under warranty i want a satisfactory resolution asap.