Problem with support of Blizzard! need help!

A week ago i tried to log in to my child’s account from my pc, i want to clear up that he had been log in before in this pc, then dont let me in, and when he tried to log in from he’s pc it saids that the paswword its incorrect, and the email of the account dosnt exist in gmail, so, the verification number never delivered. I tried so many ways getting in contact with blizzard but nothing, i dont care about my account but my son plays a lot and its a problem, please any solution? im very disappointed