In Norway I had trouble with the modem. Though its supposed to autoconnect and its supposed to work no matter witch company you use, I had to buy a new modem from my new internetprovider.
No one could tell me what was wrong with the old one, it just didnt work..
If you can, maybe try to replace each part in the connection with new borrowed ones, one by one, to see if can find the thing that dont work?
Or plan B, buy a sixpack of beer and a pizza, and start nerdhunting among your friends
Good luck