Nokia India — nokia 6

Hello, i brought a new nokia 6 on 23rd oct 2017 from amazon.in. After 15 days its display was gone blanck. So instantly i take it to the nokia cervice centre near me which is nokia care of "pandurang colony, erandwane, pune, maharashtra 411004". They changed my display but didn't fit it correctly as the light is imming out from its one side. So i again took my phone to them and submitted my phone today to them. Now i take my phone back from then and saw the same fitting problem. I asked them about it and they said that you will not have company fitting and this problem remains as it is. The behaviour of the employes is also not satisfactory. So whats the further step i should take?