hotpoint wd 420p filling all the time?

please help ,
my hotpoint wd420p fills with water all the time even when its turned off. Had hotpiont out 7 times to fix it but it still fills with water . It come in from a grey pipe at the top back of the drum. THEY HAVE CHANGED THE MOTHER BOARD AND THE COLD WATER VALVE TWICE.
PLEASE HELP BEFORE I GET MY HAMMER OUT.