You received the e-mail confirmation and had to answer that e-mail within 24h. That time passed and you did not answer, so the purchase was canceled.
Hello Oscar_Ha!
Yes, you are allowed to have more than one account, but it is recommended to have one as it is easier to buy and sell, since all your history will be on one account.
Just please note that creating other Gameflip accounts is prohibited if your account is suspended.
God speed!