If you bought the tokens with Paypal, it may take some time for the order to be processed. The Admins have had this to say about it:
Recently, Paypal has changed their check-out system and it takes especially on weekends a lot longer till they give our system the notification to pay out those reds you ordered.
When it takes 6 or even more hours, please send a mail including the paypal transaction ID to email@example.com and we'll take care of it.
In case you used a debit/prepaid card and paypal, it is possible that it takes up to 7 days before they have it verified and gives the 'go' to our system.
Please let me know in PM, if its not the case.
If it's not Paypal you bought the tokens with, please state what you used to buy them, and how long ago you made the order.
Also check on your payment method's site, if the order has been recognised, and if it gives a time for processing payments.