Question juridique clé
Whether the appeal should be admitted despite non-payment of the required advance on costs.
Solution extraite
The appeal cannot be entertained because the appellant failed to pay the advance on costs even within the extended deadline.
Motifs extraits
Under Art. 62(3) BGG, failure to pay the ordered advance cost by the set deadline allows non-entry; the case was handled in simplified proceedings under Art. 108(1)(a) and (2) BGG.