Just a update on this; I checked my email today to found out Delta had gotten back to me.
The agent exact words were "As a gesture of goodwill, I will refund you the fare difference". How does she consider that goodwill, when I didn't get what I had dished out extra money for
Her reply bothered me more than the lousy 3000 miles she threw in. I didn't contact Delta expecting anything guaranteed,
except the refund in fare difference, which I feel is justified when downgraded. It's almost like she was saying well I don't want to refund you anything, since you still flew and got there.