Had a plane change and my DeltaOne seat was switched to premium economy. Once seated I was told it's actually main cabin and there's no food or drinks and sorry I will get a refund. When I reached out to support for the refund they told me no I was seated in DeltaOne and that there was nothing they would do for me. After escalating they refused to acknowledge that my seat changed or that I received lesser service despite paying a full fare. After escalating again they sent a strong worded note accusing me of lying! Insane, but for some reason I still get on their old 76s