Samsung I450 Mobile — Lack of information

I bought new samsung I450 on 22 August 08.On 10th of september suddenly mobile stoped answring any call means i kept on pressing answering butten and could'nt ans the call than i switched off the phone thinking that will help but after starting the phone its asked for password of 4 digit i entered than it started asking another password which i never fed..i gave the same password but it got blocked and i gave it to same shop from where i purchased this mobile but they were not able to switch on the phone then they sent it to your head office and said it will take 7 days to get it repaired.Your user book dosn't have any information about security locks and even phone doesn't have information or help option for every function.I am really upset it has suffred my work and spoiled my lots of time and mood too.
I paid Rs.13540/- for the same and its not even a 1 month.

Mamta Talesara
[protected]

I need the mobile urgently either you give me alternate for the same with same function as I am leaving for Delhi and i need my phone urgently.and I am disappointed like anything being in service industry myself i hope you have same importance for your customer.