Groupon SA
2 weeks to get a refund

I placed an order for a baby chair but required a refund as I ordered the incorrect chair. I submitted a request for a refund within 5 minutes of placing the order and submitted a new order for the correct chair. It has now been 2 weeks and my money has not been refunded. I have received scripted responses stating that

"I just wanted to get in touch to let you know that we're in the process of following up your query. We haven't found a solution to your case yet, but we hope to have something for you very soon. As soon as we have some news, I or one of my senior colleagues will get back to you.
If you have any other questions in the meantime, please don't hesitate to let me know. You can reach me at any time just by replying to this email.

Thanks for your patience! "

Any further questions are met with the exact same automated response.
This should have been resolved within 5 working days - double that time and I am still sitting out of pocket. Who is going to pay the interest on my credit card for this???