If the payment status is unclaimed and the cancel link is active, the buyer can cancel the first transaction. If the buyer can't cancel the transaction, PayPal will return the funds to the buyer after 30 days.
If the buyer still can pay, then your end is not setup properly. Unfortunately as this is a member to member help group, we can't look at user account details to figure out what the issue is.
Suggest that you follow-up with customer support with your concerns. You can do this via email, phone or through Twitter @AskPayPal or via Private Message on their Facebook page at https://www.facebook.com/PayPal
