Translate the following English sentence to French:
"We have already had serious problems of this kind to contend with, as has the previous Commission, but in this particular case the accusation has been levelled that DM 300 000 were allegedly paid to an agency with nothing being received in return."
Étant donné les problèmes gigantesques qu'il y a déjà eu en la matière et compte tenu des problèmes de la Commission précédente, on lui reproche le paiement présumé de 300 000 marks allemands, sans contrepartie, à une agence.