Consumer Redressal

I brought a sony t2 ultra mobile phone in 2015 march 6. And after 2 months its network not getting properly.i give it to sony service center, pattom, trivandrum on 2015 may 26. And i said i updated its software kitkat to lollipop.and its hanging.they updated it again and give it to me.then also its network not working.they take it and checked after 20 minutes they come and told me its network IC was burned.so its have to repair.they ask me the purchase bill for gettind approvel from headoffice.after getting the approvel only they can repair or replace it.now its the 19 th day.until now they are saying they didnt get the approvel.i dont getting a positive reply. During this time from 2015 may26 to 2015 june 14 . My loss is very high.i dont have contacts to communicate.my job. My money.i charge one month mobile data for 700 rs.its waste..i loss my money and time..so please help me.