Sony Ericsson Mobile Phone W660i — service centre

I have given my sony ericsson handset w660i model for repair to the Sony certified service centre in Bangalore located in Jayanagar. It was given on 31.10.2008 and was told that it will be ready in two days. Now it is 3 weeks since but still not over. They informed me in between that it is ready and may be collected. But when i go there, the handset is handed over to me and asked me to check it up...but i found that it was not repaired and the problem i reported was still there. They took the same back and asked me to come next day...Next day I received three calls from different persons from the service centre and on repeatedly telling them about the position previous day...i was informed that now it has been repaired and ready to be collected and was told that the charges was Rs.950/-. But when i reach there, to my shock there is no change, the handset is in the same position as it was earlier day. morever a new problem which was not there when i gave the handset for repair was noticed...Again i was told that there is problem in the motherboard and they will get it replaced and that i can collected on next thursday...i.e 20.11.2008. I have not received any intimation till today. On persuasion that their landline phone is always busy and am not able to connect, i was given a mobile number of an individual, which i find is switched off after severral rings on different occasions. I do not understand how Sony ericsson is operating with such kind of service...I think this may be kept in mind by all the people who are planning to buy a mobile handset...