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On Friday my DTW-AMS flight was delayed 7 hours (sat on the tarmac for 3 hours) for mechanical reasons (discovered after boarding).
We finally left at 2 a.m.
I was also in Delta One and am Platinum.
Missed my ongoing flight to IST (only one every 24 hours).
Got a free hotel with an RT shuttle, free dinner and breakfast, $15 to spend at DTW during the delay, and €15 to spend at AMS.
I did not call at all, just took everything as it came because travel delays happen, and I got a notification that they had also deposited 25,000 miles in my account within 24 hours of the delayed flight.
So it sounds like you could get more, but maybe since you called before blanket miles compensation was given, that was all the CSR could give you at the time?
Not sure, but your delay experience/class flown/status sounds similar to mine.