Yebhi.com — Purchased Item haven't been delivered

Address:

Kolkata, West Bengal

I have a horrified experience with Yebhi.com. I had purchase a single item from Yebhi on 20th May, 2014. The order no was YBH5573778 and the item code was F8SA68. The purchase was made against a gift voucher of Yebhi.com. Though it was mentioned at the time of purchase that it will take 8 days to deliver it but it's been 18 days but not delivered. I was calling there customer support every day 2-3 times and received a confirmation of delivery date each time. But in spite of these false confirmation my item didn't delivered yet. Please let me know what should I do next?