Sony Xperia Play — not giving phone back

Address:

North Delhi, Delhi

i have given my xperia play to the sony service center at rohini on 17 july 2012 because there is a problem in phone's display. They promised to return within 7 days.............. bt they are not abe to repair it till now.... its more than 20 days.. after that we did complaint in head office also..... my ticket id no.... is 93398174...