Hii Dhiraj,

I have faced same problem with my phone Moto G4 plus and I searched in google and find near best Motorola Cell Phone Parts Store. I think, you should need to go there or order online Moto G4 Plus Camera Lens Glass.

Thanks 

Use Micro Mesh 12000 grade to remove the flaky coating.  Moisten the corner of the cloth a bit with isopropyl alcohol, then rub. 100 % fix, no mess.

The Witrigs website has Moto G4 Plus camera lens glass that you want, He also offered the Moto G4 Plus camera lens glass replacement video.

From which online site I can buy back camera lens glass......Plz help

Did a quick search and found this seller: Click here

Hope that helps.

where can i find new glass

Any cost incurred at the service centre?

i was facing the same problems just after 15 days of purchased.

i went to service center in noida and they cleaned the scratches  and my camera is again awesome.