No refund in over a month!

I bought a pair of sunglasses on 9 November but decided to return them the same day. I was told my refund would take 5-7 working days. After almost 3 weeks of nothing I attempted to Sunglass Hut but to n9 avail. I emailed them but never got a response. I left a voicemail but also dod not get a response. My husband then called and got in touch with a lady from customer care. She looked into the situation and referred us to refunds. Apparently, according to Sunglass Hut, the refund was made on Monday 11 December and was also told it would take 5-7 working days. It is now past that window period and the refund is still not in my account! We have tried to contact them again via phone and email but still waiting for a response. Sunglass Hut is useless! And I will refrain from using them in future!