Ecom Express — Product is out for delivery before 3days but not delivering the product

My order with order number [protected] is out for delivery before 3days, daily I’ll get a call and when i pick the call they’ll not say any word and they’ll cut the call before saying anything. I also tried to call them but they are not answering or sometimes they decline my call. Atlast one guy picked the call and he said they dont have staffs to deliver my product also while answering my call his attitude was very bad.