Goupon software sites are a scam Be warned!!!!!!! Internet

I tried to purchase Microsoft Office.  From Goupon.com.  I put my information in for credit card.  It did not respond with anything.  They send the charge thru to my credit union.  There is a hold for $10.19.  so they send me nothing not even a receipt.  and no product key code

I will have my credit union reverse the charges with my credit union.  I did buy Microsoft Office from Productkeys.com.  Got a receipt and keycode.  It installed and activated.  I will monitor my account for unauthorized charge.  Just in case goupon scammed my card number.