Cheque Payment stopped and Now Not Agreeing to pay.

Hi! I am a Wedding Photographer , I did a wedding photography contract in delhi and took 50% payment in advance and the rest should be given to me later with all the deliverable's but my client payed me half of the amount by cash and rest by cheque and took all the deliverable's but the cheque was stopped next day and i couldn't get my payment . And Now he never picks my call and even he's not giving me my hard drives where we keep all our backups. what should i do , I gave them a contract before wedding but they never signed it . Am i doomed or have chance to get my Payment back .