Mynta - Part of the package was missing

I have order dress of W for Woman brand which is of * piece dress( top, bottom, jacket) which costs ****. When I received package it was sealed completely but when I opened package jacket of the dress is missing and I received only * pieces of * piece dress. I raised exchange request and also raised issue in Myntra complaints. Delivery guy has exchange item with him but he is not delivering it to me cause he is awaiting resolution of the issue raised. When I call customer Myntra customer care for update of issue they give me time of ** hrs every day and still no update on issue. ( Note - when I was ordering that dress there was discount of *k only on the size which I ordered and other sizes had no discount. Somewhere I fill they gave me defective product on the name of discount and now there is no option of return or exchange. They got *k for defective product.. Seems like its scam. Myntra is doing fraud.