Nokia C3
Line on camera

I have recently purchased my nokia c3 mobile handset but after few days i saw that their was a line in my camera which can be seen on screen also. To remove this problem i first visited shop from where i have purchased it but they denied me to replace the handset. Then i visited the nokia care they also don't able to remove problem and not ready to change the handset.

please help me to come out of this situation

thanxs and regard