My first hand experience in dealing with Delhivery & Ecom Express (shopclues/ Flipkart/Paytm)- they are reasonablty good evn better 

than FEDEX/Bluedart for Ecommerce. They will deliver to the consignee Paid/COD unless they refuse. 

DTDC/FEDEX/Bluedart have more documents .. so at the slightest excuse -they return to origin...

ebay has to change.. but they wont...