[Resolved]  Sony Ericsson Mobile Phone K530i — Sim card is not reading

i purchased s mobile phone Sony Ericsson K530i on 29/02/2008.
On 3-11-08 the phone is not usable. it says insert sim card.
I took it to authorised serveice centre Accel Front line limited in chennai greams road and gave it for serveice. They said board has to be replaced and it is under warranty. they said in one weeks time it will get ready. till date it is not ready. bad serveice. it is difficult to be without a mobile communication

I do not know to whom i should make this complaing

sridhar