Questione giuridica chiave
Whether the appeal could be entered into despite non-payment of the required advance costs.
Decisione estratta
No entry could be made because the appellants failed to pay the advance costs even within the extended deadline.
Motivazione estratta
Under Art. 62(3) BGG, failure to pay the requested advance costs after a warning and grace period leads to non-entry in simplified proceedings under Art. 108(1)(a) and (2) BGG.