Please somebody help me!!!

I am very disappointed of this company, I never thought it would happen to me ... I have been treated very badly since the beginning with a very bad agent, a very bad customer service, so I decided to cancel before the first month and they told me that If I canceled before the month I would not pay anything, which was a lie and right now I have to pay 239.20 for less than 15 days that I was with comcast. Don't you think it's a robbery ???? There must be someone who can help me, can not remain so without solution, I have no money to easily give to these people ... please someone help me.

It all started when a guy came to my business promising me a better price for my TV and internet service which I liked, but when I arrived the installation they did not put the HD TV which I called the guy first and he told me that he did not believe that I wanted HD .... second he told me if I really wanted HD it would cost me $ 10 more which I agreed .... a couple of days after I still didn't have HD TV so I called comcast and they told me that if I wanted HD I had to pay $ 20 more, which seemed like a dare, it was already $ 30 more than agreed it and I said no, that was not what the guy told me since the beginning ... I tried to call the guy several times and He never answered me nor answered my text messages.

That's why I decided to cancel and it was still within 30 days to pay nothing. I called and did the cancellation and they didn't tell me that I had to do an electronic signature which is very easy to do, what I did was print it and take it with the equipment to comcast store. I thought that finally i was done with them, but I just received a bill of $ 239.20 which surprised me ... I called immediately and they assure me that since I had not sent the email with the signature is not canceled and they believe that I was still using the service... when what I did was to install immediately with frontier because I really need the internet to process credit card payments ...

there must be someone who can help me, please ...