I will try to answer yours questions:
1) the 2'000 miles should come later this month.
2) if you had a free tket and did 4 segments you should get 2'000 miles (4x500), that is right. In my wife's case maybe we are lucky or maybe it s a new promotion that I don t know of.
3) your point is correct, you did 3 segments on the 30th August so 3x500= 1'500 miles bonus and not the 1'000 like you wrote.
4) I also cannot anderstand to which flights this bonuses aply.
My guess is that one of the flight is missing in the system, maybe because you flu in one of the last day of the month. Wait a little more days and if nothing shows online them call Qualiflyer.
kooks.