Customer Services delayed response

I purchased two offers for a weekend away on Groupon as a gift. On the day of purchase I requested Groupon Customer Services to email me a voucher and I included my proof of payment on the request . I received an automated response that they will respond within 2 working days, Four days later I received another email that they are experiencing high call volumes and that they would respond within 5 days. 17 Days later they responded that the payment failed to link to the purchase and that this offer has now expired and that they want to refund my money. I emailed the customer services again and they responded that I should have followed up on my purchase within 5 days. After numerous emails explaining that I have contacted them and that their delayed response was the result of my purchase being unsuccessful they were unwilling to accommodate me and suggested to refund my money. It has now been a week later and they have confirmed that I will only receive my money within 7 days! This is a month later than the initial payment was done!!!! I will NEVER again make use of Groupon