Nkia 6085
Faulty set

Sir, i have purchased a handset in august mdel no. 6085. Since then i m facing the problem of Fluatuation, mini display faulty and por battery back up. i had sent the set to the Nokia Care 3 times but the problem still persists. the set has not been used mre than 20 Hrs. kindly change the handset and do the needful