Calvin Klein Shirt Stains, Marks With One Wash!

I just bought a shirt from Calvin Klein for my spouse. After I washed it for the first time, I noticed some weird stains that looked like grease marks once the clothing was dry. I was curious about the problem, so I decided to take it to a dry cleaner before going to the store. The person at the dry cleaner told me that the stain wasn't caused by grease, but instead it was a problem with the fabric. When I went to the store, even though I still had time to exchange or return the shirt, they made me send it back for inspection. It's confusing to understand why we need to examine an item that hasn't been worn. I'm sure they'll find a way to blame us like Calvin Klein usually does. I just want to either exchange the product or get a refund.