I tried to raise an unpaid item case but it keeps telling me that the item number is incorrect

[ac5ca]

I sold an item on EBay 3 days ago but the buyer refuses to pay or to answer any of my emails, from a facebook entry I think she is based in Bratislava, Slovakia. When I tried to open an unpaid item case I kept getting the message "item number incorrect enter another number" I tried that several times but could not proceed any further so I am stuck, how can I proceed ? 

[plpmr]

If it's Edwardian Bracelet, with 1904 full sovereign – that sold on Aug 22^nd and you cannot open an unpaid case until 2 full days have passed time from the exact time of sale.

Try tomorrow.

[*knight-rider*]

you should deal with the previous sale first and get your fees back etc, because i see you`ve relisted it. if it sells again and the original buyer pays as well, your stuck with two sales of the same item and one annoyed buyer!