50% Off On Membership!???

[bogus]

So there ya go.

Then it may be also limited only to ones who had account created before offer started and got mail with it.

[viroku]

Well I just created a brand new Funcom account, never been subbed, never been anything, and it's still full price. So there ya go.

Sorry mate but even when they have special offers you could still take on normal offer. Thing is you have to choose special offer to get it. it was big issue at the 5 year anniversary when many people subbed for 1 year normal way and not getting extra 6 month bonus that special offer gave.
Bit silly from funcom but you really had to carefully watch for it before you sub.
Try contacting live chat and asking is it possible they change that for you.