Sims 3 upgrading HELP!!!?

I downloaded sims 3 off the EA website and paid for it and all that so I found out there is a free second town on the Sims store. I go to get it and POW it pops up and says serial number please. I was never given the serial number. I used a debit card to BUY the game and was not given a serial number. Could I use someones just to get the town or do I have to contact EA?