Radio,

If I understand you correctly you purchased a second-hand video game.
This game requires some sort of on-line certification before it can be used.
That certification was provided to the original owner who did not include it
in the sale. You were not made aware at the time of the sale that such
crtification was necessary and that the game was useless without it. You did
not use the game immediately after your purchase because you lacked an
internet connection.
I'd head back to the store. They are the ones who should make good on
this problem. I hope that you have your receipt and that you have not let
too much time pass. I do agree that a game that requires an internet
connection should list that requirement on the packaging.
I do not see that the manufacturer has failed you, I think this is the
retailer's fault.

Good luck,
Dave m.