Hello,
your ELO didn't change, wrong display again, and thanks to let me know, I'll correct it !
(you can go to check ur ELO after leaving the End of Match screen, in the Network menu... the ELO shown in the End of Match screen is the ELO before the match)
EDIT: about the 2/0, u didn't get points probably coz ur ELO was too high compared to your opponent, so leading 2/0 wasn't enough to earn new points...
You can even lose points when winning a match : for example, if u win 7/6 with a 2500 ELO against a 750 ELO u'd probably lose points, and your opponent will win some points...