After two tries, I'm done

Within a week of recieving this bed, the pillowtop started bunching up so that there was a raised ridge running down the center of the bed horizontally. Called Macy's and they sent me a new bed. The new bed came already bunched up at the very top! But the delivery guys said this was a result of moving the bed and that it would flatten out in a day or two. Extremely doubtful, but I decided to give them the benefit of the doubt and wait. After another week, the new bed is now bunched up in the same spot as the first, even worst than the first. The only upside to this whole mess has been macys customer service, they are refunding the mattress and picking it up free of charge. There is obviously something very wrong with this model, my old pillowtop bed is over 20 years old and never became bunched up or uneven.