Bestylish.com — Invalid Gift Voucher Issued

I have purchased a bestylish voucher of Rs.1000 from dealsandyou.com for Rs.99, order no. 130191.

I tried to use the same voucher on 31st Aug 2011 (last of the voucher validity) I got an error that the voucher is “INVALID”. I also notified the bestylish customer care about the issue but they said the voucher needs to be re-activated which it would take 24 hrs and by then it will be expired, so you cannot use the voucher anymore.I tried to explain them that it wasn’t my fault that the voucher shows invalid, it’s the problem with their system so why should I suffer for something no my mistake and I tried to avail it before expiry date.
I have tried to explain the same thing again and again them but now they aren't even replying.
So kindly help me in getting my voucher.