Delay in refunding after receiving damaged goods

I ordered a 5 Shelf shoe storage with full length mirror on the 17th of July '15. The goods were delivered on 23 July '15. I did not get a prior notification date that my goods would be delivered and so when the courier guy called I asked him to leave my goods by my next door neighbour. My neighbour showed them where to put the parcel and they did that and left. When we arrived home we went to fetch the parcel and before we could even open the box it fell open on its own and pieces of glass fell out! We did not continue to open the box. Groupon told me that I should return the goods and I did so via their website and the courier people collected on 30 July 2015. I was told that the refund would take place after 10 working days. I have phoned on 3 different occasions