Delhivery — Order Return

I have ordered a shirt on[protected] on Ajio app.Few days later i have been informed that my order was cancelled for some unknown reasons and the shipment was processed back to the warehouse.Today[protected]All of a sudden i got a call from the delhivery courier partner telling me that i have an order to take.So i took it by paying the money through COD.Finding out that it was the shirt which has got cancelled for some unknown reasons i tried to return the order but i could not find any order details related to the delivered item.Please help me.