Still no refund

I bought a groupon voucher on the 18th Dec 2015. On the 22nd of December I emailed from my gmail account a cancellation and refund request. Gmail address [Email Removed] On the 4th January I emailed a request again this time from the Groupon site. I have made several follow up calls to the call centre as well as the Groupon site. Call centre agents spoken too are Zuma on the 7th and Karl on the 13th. Karl the most unfriendly and unhelp person ever. He also promised to phone me back which he never did. He also refused to provide me with his last name his attitude \complain any where you like even social media". I reply to each and every generic email I get from your customer support and still no refund. When are you going to refund me and why is it taking so long? This is my first bad experience with Groupon and I must say I am extremely disappointed."""