The only way to get it fixed permanently is to visit service center and ask them for camera replacement if it's within warranty then it would be done for free 

My issue got resolved only after I gave my phone to service center for camera replacement which was ridiculous as they assured me to get the servicing done in 4-5working days but resulted in 2weeks odd of waiting time.

the final and most effective solution is to visit the service center and get the camera replaced.after that it is working fine as of now but then the quality of service is very cheap as when the replaced the camera they did something wrong with assem...

no they didn't charge anything

take it to the service center and they would try the following1. update the phone might get resolved , but that didn't work out for me.2. they would disassemble the phone and check if their is any visible issues, and then reassemble which in my case ...