Ekart Logistics — Parcel Return to Origin without delivery attempt or the receiver notice

I ordered an item from individual seller via ekart logistics, I was tracking the shipment multiple times daily, but today suddenly they cancel my order and shows RTO : order_rejected, they haven't even called or noticed me, I have paid 17000 to the seller already and the shipment is don't know where, now it won't reach to me and I am confused what to do with this.