Comcast / Xfinity review: My phone - land line, my computer and landline

Recently comcast, xfinity took over my phone, my computer and my smart tv; I could not use any of these digital appliances after comcast - xfinity sabotaged my equipment. They told me that they, xfinity, would not restore my working land line phone, computer, etc. Unless I made a $109 payment, approximately, or they would not restore the service of my land line, phone, my computer, and my smart tv. Is this legal? I have a cell phone but they do not know this. I am 81yrs old and what if I had an emergency phone call to make. Within the last year I spent one week in the hospital with a serious medical condition. Thankfully, the condition, situation, has improved and been eliminated. So this is not conjecture, an emergency is a real possibility if not probability. This appears to be a form of blackmail. I made a payment because the gave me no other options, choices. I live on social security and can barely pay my bills in the past few months I have had to over charge my bank account and pay an additional $32 per month. These people, xfinity. Appear to be as heartless as former president, tumpty dumpty how can I get back at them and make them act like somewhat decent human beings. Which appears next to impossible. Thank you robert valdez, retired