Delhivery — Didn't deliver the courier but marked as Delivered.

The seller from Fashion Villa has sent my prepaid courrier via Delhivery on 14 th July from Surat. He sent a photo of the package with the tracking number to me. I have been tracking the courrier ever since. And finally on 20 th July the tracking showed 'out for delivery'. So we have been waiting for calls and SMS from them. But that day courrier didn't come. In the evening when I checked tracking it showed Out for delivery on 21 St July. So Again I waited and waited on 21 St july. And there was no sms or phone call and no one came to deliver and In the evening when I checked tracking, it's shown as 'Delivered '. It was shocking.
And when I tried to call to call someone there is no helpline or customer care number. All we can do is raise an enquiry with that company. And the seller has raised an enquiry. But they haven't contacted even now. There is absolutely no way to reach anyone. It's 28 th July today. It's been way too many days and I have no idea about the whereabouts of the courrier. Kindly help me. I have spent so much time, effort and money behind this.