You can't until you have closed down the First Sale. Open an Unpaid Item Case in the Resolution Centre after 2 days. Close on day 5. Your Final Value Fees will be Credited back to your Seller Account. The Non Payer will receive a Damaging Defect on their Account. 2 of those in 12 months and they will find it very difficult to Buy on here again. As most Sellers Block Buyers with 2 or more Strikes in 12 months.
