Cornerstone Development

I purchased a Groupon from "Cornerstone Lighting" to hang my Christmas lights. I called 719-432-7851 as instructed. After leaving 4 messages which were never returned, on my fifth call, some one (unidentified)answered and we set up an appointment for 9:30 on December 4th. They never showed up and I have left numerous voice mails asking to be contacted. I have not been contacted. Revdex.com shows that phone number is Cornerstone Development. When looking for Cornerstone Lighting on the Revdex.com web site is shows that the phone for that number has been disconnected. It appears the name "Cornerstone" has many businesses non of which are responding to phone calls. Groupon has refunded my money and is no longer offering that coupon. Although the company is not Revdex.com affliated, I feel people should be aware of the issues I have encountered with this company.