No voucher receive for GA Rouge Restuarant

The customer service from Groupon is really not up to standard. I bought 2 voucher from Groupon on the 14th of July and sent the proof of payment through to them. The 1 voucher was cleared and is available. The other voucher is still not cleared and after 4 emails with no feedback , I phoned them. They could see the payment on their bank statement but the promotion is no longer available and they will credit my Groupon account in order for to buy another voucher. Another 3 workings days have passed and still no credit to my account, no voucher and also no refund. How long am I suppose to wait for Groupon to process the transaction. It is unacceptable that no-one gives you any feedback, your money just disappear and Groupon expect you to be happy with a lame excuse.