Confusion between call centre & staff

I purchased a Spa day voucher from Groupon.<br> <br> After contacting the partner to organise the spa day, we were unsuccessful and with the expiry date fast approaching the partner got hold of us and redeemed the voucher but we had not been for the treatment as at the date of the partner redeeming the voucher.<br> <br> Eventually the partner could not help us and we didn't to use the voucher any longer due to bad attitude and not accomodating us in the required time.<br> <br> I called grouponn call centre and explained the story and the person i spoke to said that i must get a letter from the partner stating that we never used the voucher and that he would refund the money into my bank account. I sent through an email with the attached email on the 20th of August 2015, i received a reply yesterday, 09 September 2015 stating that they will credit my Groupon account. I have purchased 3 things from Groupon in the last 6 years and the fact that 2 people can have totally different stories is ridiculous.