Blocked Internet account

My internet banking account has been blocked, because i inserted an incorrect password twice.<br> I don't understand why the system blocked my account internet account after i attempted only twice to login. <br> And now i'm trying to reset the blocked account on line and it keeps saying\ Some required fields are not valid". i can only hope i wont be charged because of your system error. i'd rather not have the fnb account if such things are gonna start happening."""