On 4/18/21 I did have a flight change [several days after my post #1]. On www.delta.com, each time I try to view the itn the DATE changes: 12/21, next 5/7 etc., even though the flts. #s are now updated, they have me leaving and returning on the same day, arriving in LAS after I've departed.
On the APP everything is correct.
Yesterday, after 1 hour on hold with DL Vacations, I hung up--I'll try again today; there is no callback option.