Motorola Phone G2 — Regarding charging of phone

I purchaesd moto G2 phone from flipcart, by august 10th the phone bacame too slow and suddenly it didnt got charge and even the battery charging symbol was not shown. I visited nearby authorised service centre N R Markeeting, Muslim hostel complex, Davanagere, Karnataka. They took fifteen days to my phone repaired and returned me telling the mother board has replaced with new one. After i brought my phone to home and kept foe charge. it took almost two days to get completely charged and the phone becomes heat When i switch on the phone the battery gets exhausted in two hours, even if i dont use the phone it gets heated. Please replace my phone with a new one, or set the problem with the battery. I have fed up with visiting the service centre now and then.