[Resolved]  Nokia 2310 — keypad lock not working

I am submit my handset to nokia customer care in sakarpur , delhi for 4times but always the same problem accured next day , then after I,m give my handset for 2 weeks then they gave my handset yesterday , today the same problem will be accured and 1another problem is also attachedwith that low sound .For that I,m come to varun enterprises to say that but there is no hearing of my problem and behave rudely