In the same boat here, asked and got me my 500 this year. 5 year old account.
In my situation applied "back side curve & warmth" method to a card for a few month, then spend a bunch and pay it off few times like that with in 2017/18.
Didn't work. The card is still as at arrival, 'strait', and 500 was given.
Congrats! Great that they threw you a bit of a bone!