Definitely contact Maureen via PM about it and I'm sure she'll fix it right up. Make sure you put a descriptive enough title so it catches her attention, like "Bought Gold and it hasn't actived in several days" or something along those lines so she knows what the message contains.One thing you can check is to make sure you didn't accidently order the GIFT Gold membership, if you did, don't frant, just contact Maureen (again, via PM) and let her know you made a mistake and would like it activited to your account.
To check if it was the gift gold you can enter your "My Profile" and go to "Membership" tab, there it shows the history of gold membership orders, if it was a gift it'll be listed as such.