I purchased Allianz insurance on the Delta website. I am a Platinum Delta member and purchase insurance on international trips but this is the first time I have made an attempt to make a claim. From the time we purchased our two tickets to the time of flight my wife (ticketed traveler) was diagnosed with cancer. She had never been diagnosed with cancer before. Her diagnosis requires surgery and treatment and i cancelled the trip. I submitted forms from MD Anderson and the cancellation information from Delta (tickets and insurance purchased on Delta website). After 44 days of no response Allianz sends a letter saying I need to send additional information including "Verification from travel supplier on their letterhead regarding any refunds received" and Verification of travel supplier's penalties or copy of literature describing penalties". Please note Allianz is a Delta partner, this policy and plane ticket were purchased on the Delta website. I don't know what I will have to go thru to get a letter from Delta on there letterhead and I would think Allianz knows Delta policies on penalties. I will no longer purchase insurance from Allianz. Delta is very generous on offering credit and since we fly Delta frequently will use there credit. I would advise others to do the same.