my name is sreenath.i have purchased nokia mobile phone (c7) on 3rd sep 2011.within 2nd week itself,its headphone become complaint.i contacted nokia care center.they replaced it.then began problem of overheating.i again contacted nokia care center.they updated software twice.but didnt get the problem solved.so they send the handset to delhi.i asked them for replacement.but they said that if the complaint is repairable,then there will be no replacement of handset as a whole.i contacted nokia customer care several times.they also gave me same reply.when handset is returned after service,they said that motherboard of handset has been replaced.and imei number has changed.the worst part of the story is next.the phone was looking new when i gave it in nokia care center for service, but when it came after replacement of motherboard, the phone had a lot of scratches and it was looking like an old handset.i asked them for rplacement .but they didnt agree.my question is that whether i can file a complaint praying for replacement and compensation.i have all the relevant documents.will i succeed in court??.shall i hire a lawyer or can i do it myself?if i do it myself ,will it be a problem if i make a mistake in preparing complaint?whether that mistake in complaint will be a reason for rejecting my claim???