if everyone called them at their Ca headquarters, and kept hitting 0 every time it beeps for a message, maybe we can cost them some $$ in 800 calls?  877 593-2995.  California HQ for National Renewable Energy Center

If you read the consumer reviews of A1 Solar Power online, you wouldn't EVER want to use them, even if they didn't flagrantly violate the DNC regulations.

Take a moment to leave them a review on their yelp page. http://www.yelp.com/biz/a1-solar-inc-los-angeles?nb=1

They go by the name A1 Solar or Hot Solar.

Total harassment!  So far I have received 14 calls from the bogus "St. Helena" number in the last few days.  After 8 calls in one day, I cursed the guy out and told him to take me off the list.  I am registered on the DNC list.  Of course, I received another call within the hour.  Blocked that number, then they started calling from another spoofed number, which is listed here.  We answered the phone this morning, and the guy on the line was aggressive.  We asked to be taken off the list.  The calls kept coming today as well.  I now have that second number blocked and I filed a complaint with the FTC.  WHEN WILL THIS END!  

File complaints with your State Attorney General, and contact the PUC and file complaints also.

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/

You might also want to consider getting a call blocker, device or phone..
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=call+blockers