Won't refund my money - ignores my emails

Bought voucher from them for 4 cakes from AMU CAKES in Pretoria West. I was not satisfied with the decorations they were going to use and insisted they correct it. Amu refused and cancelled my order. But then she refused to give Groupon permission to refund me, even though I have not received my cakes. <br> Groupon now insist that I give proof that the supplier (AMU) cancelled the cakes, as she is now saying I cancelled the cakes. How do they want me to proof that. Why don't they ask the supplier to proof that I cancelled them? They believe the supplier over me as client.<br> I have written them numerous emails from 8 October, phoned them also. They insist I give proof, otherwise no refund.<br> WHY would I cancel the cakes 2 days before a big function I needed it for? I wanted the decorations rectified, as any client would would want, but Groupon does not care about that. Bad, bad service from Groupon and their supplier. I am cancelling my Groupon membership and will never buy from them again.