auto forward hacked

Someone has gotten into my account and sets auto-forward to another email. They then make a purchase and use my account to approve it. I have spent many hours with customer service and dealing with your frustrating, angering telephone system. Three different people have told me that auto-forward was disabled, they either lied or were misinformed. Your customer service is horrendous. It is very difficult to even speak with someone, and when you do it is someone who doesn't know anything. It is impossible to speak with an American who actually knows something and is not reading from a script. I am reluctant to leave Comcast as I have been using it from the beginning and would not like to lose the email address that I have had all these years. If I cannot fix this problem, however, I will have to.