Questione giuridica chiave
Whether the constitutional complaint could proceed despite non-payment of the advance costs within the set deadline.
Decisione estratta
No; because the advance costs were neither paid nor duly proven as paid within the non-extendable grace period, the complaint could not be entered into.
Motivazione estratta
After an extension under Art. 62(3) BGG and an express warning of non-entry, the appellant still did not satisfy the advance-cost requirement in the prescribed manner; therefore non-entry followed under Art. 117 BGG in conjunction with Art. 108(1)(a) BGG.