hayan desconocido
Present perfect subjunctiveellos/ellas/ustedesconjugation ofdesconocer.

desconocer

El Gobierno de Colombia deplora profundamente que sus disposiciones hayan sido violadas sistemáticamente y se hayan desconocido nuestros llamados.
The Government of Colombia deeply deplores the fact that the provisions of that resolution have been systematically violated and that our calls have gone unheeded.
Word of the Day
milkshake