no feedback about my refund

I had purchased an item on the groupon website a while ago. I made a payment of R350 instead of R349 like was stated for the goods. When i called the call center last week wednesday the gentlemen said that if i send through a proof of payment that i would be refunded between 3-7 working days. i have not recieved any feedback about how far they are with my refund. when i called today they closed at 12 noon. i want my money back. R350 is not small change. surely if you value your clients , you would make issues like this a speedy process. why did i send a proof of payment? for it to be put in a box and no one sorts it out.