Question juridique clé
Whether the complaint could be entered into after the court advance was not paid within the final deadline.
Solution extraite
No. Because the appellants neither paid the advance in time nor provided the required proof of timely payment, the complaint could not be heard.
Motifs extraits
After a warning under Art. 62(3) BGG and a non-extendable grace period, failure to comply triggered non-entry under Art. 108(1)(a) BGG.