Questão jurídica principal
Whether the appeal could be heard despite non-payment of the required cost advance and failure to provide a Swiss service address.
Decisão extraída
The appeal could not be examined because the appellants did not pay the cost advance within the non-extendable time limit and did not comply with the order to designate a Swiss service address.
Fundamentação extraída
After proper service under Art. 44 BGG and a final warning under Art. 62(3) BGG, the advance was neither paid in cash nor duly credited through the permitted payment methods; therefore non-entry under Art. 108(1)(a) BGG followed.