Early termination fee.

 I was charge an early termination fee.of 230 dollars. I was  having problems with my Internet service for a month. I called several times and they sent out a technicians and found and ground wire loose.   I called an operator and said I still have interrupted service the next day. They told me Only thing you could do is upgraded the service from 59 to 84 dollars a month it will be a stronger signal and it worked fine after that. When I went to cancel the Internet service which I do every year because it was seasonal non-contract. Comcast  sent me an early termination fee saying that I owe 230 dollars  because I upgraded to a stronger signal. I said I had problems with the Internet service and the only way to get service was upgrades so I paid more money.I called back and talked to a manager and they told me sorry nothing we can do even if it wasn’t your fault because when you upgrade you signed a contract. I told them I signed a contract  in the middle of upgrading while I was on the phone for 90 minutes trying to figure signal issues out with operator to Why would they charge me a fee?  how is it my fault when the  other service was cutting out all the time and all I wanted was the service to work?