Ann's Cleaning Service Groupon Code Needed for Services? Internet

I purchased Ann's Cleaning Service through Groupon.  It lead me to a website where it requested for the Groupon code.  Every time that I input it, the site indicated that the code was incorrect.  I tried calling but they never responded.  I ended up not using a Groupon service and paid for Land of Clean to straighten out my apartment.

Months later, I received an email from Groupon that asked if I wanted to purchase the services again.  So I just contacted Groupon and they tell me that the services were rendered.  What?  Wait.  This is a scam to input a Groupon code for "FREE" money.  The customer service representative couldn't do anything since it's past the redeemable point.  Apparently, this is being escalated to a different department.  I hope that it gets resolved or I literally paid for NOTHING.