Zando

I purchase clothes for my kinds at Zando online ,so 3 items where out of stock which I paid on 24 November 2019 they confirmed my order .The next day I received an email saying 3 items are out of stock n vouchers .On 25 November call their call centre requesting are refund n the lady I spoke with said I will get my refund in 3 to 5 working days ,Still waiting till today 17 December m calling everytime get the same story ,wait 7 working days my request is still pending ,struggling to get that refund ,I email n call but nothing very useless n poor customer service