they are relentless....wasting my time and harassing me

Rings, and then hangs up when I answer.

Finally left me a message on the third call. They are calling on behalf of the CPS energy rebate program to install energy saving monitoring in your home. I believe it's a third party vendor called UPA or something like that, and it is a solicited call, meaning you may have opted into the program at some point through CPS.