Questione giuridica chiave
Whether the appeal had to be declared inadmissible because the advance on costs was not paid within the final deadline.
Decisione estratta
Yes. Since the advance on costs was not paid within the additional non-extendable deadline, the appeal was inadmissible.
Motivazione estratta
Under Art. 62 LTF, failure to pay the advance within the second deadline leads to inadmissibility. A further extension is exceptional and requires specific unforeseeable reasons, which were not shown.