Swiggy — Complementary item is missing

I ordered chicken 65 2 boxes with that complementary black forest cake is given in bill but that item is missing.

Delivery boy name Bantu Siva, he first didn't delivered product at location but message came delivered so I thought product was delivered at location where my parents live so I rated four stars, later they called me and said product didn't came or no phone call has came so I again raised complaint in swiggy they gave me executive number when I call them he said they are not lifting and I went for product and take by me at other location in black forest cake is missing he says that four seasons has not given but in bill it is typed