Join Date: Nov 2000
Location: Nashville -Past DL Plat, FO, WN-CP, various hotel programs
Programs: DL-MM, AA, SW w/companion,HiltonDiamond, Hyatt PLat, IHF Plat, Miles and Points Seeker
Posts: 11,405
I totally understand the OP, being a Diamond.
But, at the same time, the original ticket was a coach ticket, so still getting a coach ticket is not all bad.
But - upgrading others does not make sense.
Maybe the automated swap just went haywire.
Or maybe, the color of your luggage was wrong. You know... the new color by numbers Delta boarding system.