Sony Ericsson Yendo — Dis-satisfy with Sony Ericsson W150i Yendo handset

Address:

Delhi

Recently I purchased Sony ericsson make mobile phone yendo W150i. but after using it for few month I found that phone is getting hang frequently and also I am unable to play music files and whenever I try to open any music file mobile gets restarted. This is very annoying and the memory card card in the phone is not showing any data which is there in memory card, neither it is showing free memory available in that memory card, but when that same phone is connected to the laptop or any other device that it is showing the data of memory card. I tried calling helpline number of Sony but they said helpline number change and they gave me new helpline number, when I tried calling in new helpline number than auto voice again say the same thing that helpline number has change and this is the new helpline number. I am tired of calling then and even locating the service centre of Sony but I am not able to trace anything
Please replace the phone with any other model in its range or please refund the money...