[Edited: Language} up account

I'm still upset about a rep messing up my account over higher internet speed. I was taking with a rep about Internet speed, and he told me that he could make my speed faster without making my bill higher.  I told him ok and to tell me more. He proceeded to tell me that all I needed to do was change my home, phone service, but what he failed to tell me was that he was going another cell phone. I did not want this however, he told me this after I accepted the contract. I told him to cancel the contract, and to put my account back to what it was. He told me everything was canceled and that everything was back to normal. I called for three days in a row to make sure there was no changes made to my account and finally I got my bill with astronomical charges. Why am I being penalized for the irresponsibility of one of your representatives? I want my account, put back to what it was, and what I was paying he lied to me telling me I would be paying less and now I'm paying even more. I want this fixed!  is there anybody that can help me? I've been a Comcast Xfinity customer for a long time and very loyal, but this is getting to be out of hand.