dear sir / madam

I have purchased a lava Pixel V1 mobile from M/s Net to Net at Agartala, Tripura on dated 9th October 2015 and I faced a problem as a backside camera not working and I went to service center in Joynagar, Agartala ( Mob- 8794710501) and they had assured me that, they will change the camera and camera will be same as like before. After 12 days of handed over to service centre they called up for pick up the phone from service centre. When they handed over to me I checked my back camera is working but resolution of camera was not like earlier and after that when I tired make a selfi I found front camera is not working where as my front camera was totally ok when I handed over to service center. I asked to the service boy why my front camera is not working, as a answer they said they are not aware about front camera. They are totally damaged my front camera and their attitude of talking is horrible. And they said they have solution but I have to pay Rs.5500/- where as I have warranty period.
Please let me know that the service provider you are engage they are actually have a quality to find a problem properly and make the solution, according to me they are not a technically skill service provider and your company mobile are also not recommendable to others .
After having Lava Pixel V1 lots of problem found in this mobile and within a year camera problem etc. So this is a worst experienced with this smart phone in my life. I want my phone front camera must be ok anyhow.
The detail as followed

model : Lava Pixel V1
IMEI 1 : 911452550876180
EAN: 8906037890155
CUSTOMER NAME : Taslima Begam
CONTACT NO : 8014347836
Awaiting for a positive response