Peace to All
Allah the All-Wise makes it crystal clear in his Book that the dead cannot hear... If you keep pursuing this way, then you will simply be defying the Almighty's words..
"Verily you cannot make the dead hear and you can not make the deaf hear the call when they turn their backs and retreat."
"The living and the dead are not alike. Allah makes whoever he wishes hear, but you cannot make those in the graves hear."
This is very clear... Hopefully this case can be closed... At least for me
Allah guides whom He wills...