Bought the game and can't play Multiplayer (5days

I start up MCC on PC, head to multiplayer and when I press “Play” and get a message saying “Contacting server to get the latest matchmaking data. Please wait.”.
I have reset my computer, reset steam, restarted Halo MCC and I am still cant play…reinstalled the game, logout and Login, NOTHING works.Thanks guys I hope someone can help. Me, bought the game 4 days ago and for 4 days im trying everything to fix this. Can’t even refund the game anymore

You can still get a refund. If I was you I’d verify the files

Guys, I upgraded my WIN7 service pack 1 to WINDOWS 10 and now the game works perfectly.