GROUPON Sold STARBUCKS Card with INVAILD Promo Codes Internet

I have read some horrific experiences describing Groupon and I believe everyone.  I purchased a Starbucks Gift Card from GROUPON but when I went to use it the Validation Code was no Good.  I began callong the in January to rectify the problem only to have them not do a thing. I then began emailing Groupon only to be told that the problem was on STARBUCKS end. Upon contacting STARBUCKS and telling them that I have been wrestling with Groupon for over 2 months to have them Honor a $5.00 gift card that I purchased for Starbucks they informed me that Groupon had given me an Invaild code.  

How Petty is that?  2 phone calls and 13 emails and they keep offering me a Groupon credit.   I told them to honor what I paid for the Starbucks card or a $5.00 refund. I did not purchase a Groupon for a Groupon Promo Code I purchased a Starbucks Card.  When I spoke to Starbucks they said all that Groupon needs to do is grant me a Valid Starbucks promo code to resolve the Issue and Groupon can't even get that right.  Really dumb, Groupon must be doing really really bad. Buyer Beware Groupon is Very Petty and will not issue a monetary refund even when they cant produce what you paid for ii the contract.