I also bought a Groupon. I called before the expiration date and they had a full voice mail that said they will discount their services for the amount I paid. What? That isn't a discount.
When I emailed the company, they responded but blamed me for waiting too long. The fine print doesn't that services have to be completed by a certain date. I thought it was okay if I scheduled it by the expiration. I was fine with waiting, I just wanted to schedule it and not have to pay full price since I had already purchased the Groupon.
I have requested a refund from Groupon and am carefully researching other companies to do quarterly service for us. These people have to enter your home, so it's not worth it to let someone into your residence who you you have to fight with to get them to do the right thing!
In the future I will not purchase any service like this from Groupon without thoroughly researching the company first. If there isn't enough information on them to do that, just move on!