Delhivery — Order delivery delayed

I have order some products from mango.com on 26th nov .. who e-mail me the tracker no on 3rd of November i.e.[protected]. As per their delivery partner DELHIVERY.COM. it's been showing that order is yet to pick up front merchant. However I have called and e-mailed the merchant and they have confirmed, that they have send the courier from their side .Kindly check .. my order is stl showing as order pickup pending since last 11 days ... I've been more than 11 days I have not received any update from the company and now I don't know to whom to contact or complaint