Nokia mobile 5130
No battery back up

My mobile IMEI no is 353761040694531 . in my mobile so many problems . no battery back up. after call, it remains white screen. no auto updating. i have given my mobile 4th time to repair. job sheet no. is 333465550/101224/47. i have complainted in nokia care customer by phone. complaint no 1-11382068581. i want to replace my mobile. so please replace my mobile