Request for cash refund

On the 5th of August I ordered Two A1 canvas prints via Groupon.Under Group on's Q& As it says that they notify customers of order changes 21-31 working dats after order has been confirmed and therefore I waited hoping that i will get an update regarding my order with 21-31 days.I waited and waited,and did not hear from Group on or Print Express.I sent emails and called to find out what was happing but everytime i was promised that my order was on the way.It was only in the 17th if September when I called Print Express that i was told that they could not make the canvas prints for me because my pictures were of poor quality.I requested for a refund on the delivery fee R65,and I got that.When I request for a cash refund from Groupon I am told that my request for a refund is outside the 7 working day cancellation period.It is not my fault that Print Express Online didnt tell me on time that my pictures were of poor quality.It took calling them and sending emails almost everyday for them to tell me that i was not going to get what i had ordered.If they had told me on time instead of making me believe that they will deliver i would have cancelled on time.I just want my money back