Questione giuridica chiave
Whether the complaint is admissible despite non-payment of the cost advance within the extended deadline.
Decisione estratta
The complaint is inadmissible because the appellant did not pay the advance even within the grace period.
Motivazione estratta
Under Art. 62(3) BGG, failure to pay the required advance after the deadline extension leads to non-entry in the simplified procedure under Art. 108(1)(a) BGG.