Zando - bad customer service

I bought boots from Zando which where a size 7. They delivered size 6, with order number ***. The boots were delivered in the same week I had placed the order online. I called them the same day after they'd been delivered to tell them to collect them as they had delivered the wrong size. I was told Id have to wait till Monday to log the collection as they were delivered on Friday. Monday came and I logged the request. It has been a whole week and I have not received my refund as I made an eft payment directly to Zando. I am so agitated as Zando should not be making me wait this long to receive my money back since the fault was on their side. I do not care for their refunds policy. I have worked at an online customer service company called Groupon and I know all about the internal escalations that can be done to resolve my case. But no, Zando has proven that customer service is not one of their strong points. I even contacted them yesterday and I was given the run around...Lwando, Their agent promised to call me this morning to advise on the status of my refund, but till now I have heard noting from them. The service is shocking to say the least. I will never purchase anything from them again... I WANT MY MONEY!