CD KEY already in use -.-/clave de cd en uso -.-

[Phoenix]

In English: hi , yesterday i bought Call of duty Black ops at GAME ( that's a game store)
and when i try to install it i get this problem:
your CD key is activated in other steam account, so i can't install the game...
what can i do? i sent ticket to steam support with the problem but i have no answer.

Español: hola, ayer (sabado dia 29 de septiembre) fui a GAME a comprarme el Call of Duty Black ops y para mi sorpresa, al instalarlo o por lo menos intentarlo me salto un pequeño pero muy fastidioso error que me decia que la clave de CD que yo habia puesto ya estaba en uso, por lo que ahora no puedo hacer nada, ya que no me deja instalarlo sin antes haberlo activado en Steam...
ya he enviado ticket a la empresa pero no me han dicho nada, alguien me podria decir que hacer?
no estaria mal que me enviaran una clave nueva o algo por el estilo aunque no creo que aqui se hagan regalos de ese tipo -_- (seguramente me toque ir a devolver el juego la semana que viene...)

[w0rm_lord]

Take it back to game and tell them the problem, they will re emburse you or give you another copy.

Was the CD key completely sealed from view when you bought it?
I have had this problem where the CD key was just bad, and they changed it.

[Phoenix]

No, the CD key was at the last page of the instructions, the box was empty they gave me the instructions and cd key at the same time when i bought it

[w0rm_lord]

Then deffinetly take it back to the shop, either its faulty or one of the employees or a customer stole the CD key.

Never buy games that require online activation or Online play with CD key unless they are completely sealed.

[Phoenix]

thx for ur answers i'm going to take it back next weekend (and if it's possible i will try to get a new one /or maybe new cd key -_-)

[w0rm_lord]

Don't let them bully you, demand a new one sealed or your money back.

[Phoenix]

of course, i want my money back or another one cod