Hi
1) Since you have purchased a Sony High Power Home Audio System based on the promises made to you by SONY on their website, you might choose to file a cheating case under section 420 of IPC at your nearest police station.
2) However in the event of you filing a cheating case/criminal complaint, the accused will get punished and will be sent to jail, but you will not get any refund of your money by filing a criminal complaint.
3) Please note criminal cases results only in conviction/acquittal of accused. The complainant does not get any monetary benefit except the feel good factor that the accused has been punished in accordance to law.
4) In order to get refund of your money also get compensation for damages from both infibeam and Sony, our recommendation is to you to file a case in the District consumer forum.
5) In District consumer forum, you also have the option to appear as party in person and can argue your own case and in district forum's the costs of litigation is cheaper and consumer forum's are speedier compared to civil courts in dispensation of justice.
Hope this information is useful.