Ecom Express — Too much time taken

Since last 3 days I am getting a message in morning saying 'product will be delivered today' but at the end of the day I get a message ' delivery failed' even your delivery person is not trying to contact me. I have to stay at home to recieve the product since past 3 days leaving my all work. And today it showed ' ofd lock applied '. Kindly solve my problem as I need the product, otherwise I'll have to go to consumer forum.