Registration code cd key invalid

[kaiouti]

Hey, Ive already sent 2 support tickets to square enix
(Ticket Number: 4000344 Ticket Number: 4000727)
and I sent a message to the games steam forum,
I REALLY want to play this game, well I already own the game on ps3 (and trying to use ps3 character)
and I got support to get the pc license and
was told to buy the game again on steam (so I could buy more time with steam credit)
and then activate the registration code only problem is I don't know where to find the code,
I tried the cd key but it said it was invalid on both the account pc windows license webpage
and in the launcher after I clicked already have an account, PLEASE HELP square enix,

I REALLY wanna play!!! btw I have received one email confirming they have received one of my emails but not the other one yet...

edit: Ive received the second confirmation of received email yet no replies with help...

edit2: oh and I checked my cd key on steam and it's changed, Im kinda reluctant to try it as the registration code cos I don't know if it IS the registration code (and where to enter it) and Id prefer to wait for instructions, still none as of yet

edit3: whoops turns out I was looking at the cd key for another game! oops
so I still have the same invalid cd key, well invalid to use as a registration code if thats what it is