Comcast needs to stay with internet.
Get a real alarm company, I install many wireless systems like your describing above, the fact that they did not assume the (touchpad or whatever it is) was bad boggles my mind. Typically with that many sensors falsing, 1) the system was installed by someone who had absolutely no clue what they were doing OR 2) the unit that communicates with the sensors is bad, they should have replaced it and tested it again.
I'm sorry you had that expereince! It does sound to me like you recieved some potentially bogus information and I wanted to post some detail here for you as well as others who might read this post.
The location of the Touchscreen can actually matter a lot. It is the central hub for communicating to all of your security sensors. If it is moved, you risk creating poor communication between the Touchscreen and some of the sensors. This can also have the effect of draining the sensor's batteries, as they may need to boost up the signal strength as they struggle to communicate.
During installation, the technician will run a diagnostic test to make sure all sensors are in good communication. If they aren't , they will troubleshoot until all looks good - this sometimes involves moving the Touchscreen to a different location. In rare cases, a Signal Repeater may need to be installed. Once a good spot is determined, the Touchscreen should not be moved.
Also - our newest sensors do have LED's, but they are only set to turn on during the installation process or while being tested. It would be nomral to see these sensors not turn their LED's on. This was done in response to customer feedback on making our sensors blend in more with their home and making them more visually appealing.
Also - rest assured - Xfinity Home is a Professionally Monitored, award winning security system. If things aren't working well - give us a call and we'll work to make it right ASAP. There are very few situations that we can't resolve. I do hope you give us another try!