Question juridique clé
Whether the complaint could be entered into despite the missed advance-payment deadline.
Solution extraite
The Court would not entertain the complaint because the appellant neither paid the advance on costs within the extended deadline nor timely proved payment.
Motifs extraits
Under Art. 62(3) BGG, failure to pay the ordered advance within the additional deadline permits non-entry; the procedure was therefore terminated under Art. 108(1)(a) BGG.