ZANDO TOOK MY MONEY AND CANCELED THE ORDER

I placed an order with Zando on 20 November. I paid them with the debit card method. After paying the amount and receiving an SMS notification from my bank that the money was out, Zando sent an email that the order was cancelled because the payment was unsuccessful. I immediately called them to explain this and they said they reversed the money back into my account and I should receive it within 3 days. 3 days later the money was still not in my account. I called them again and they now said it would take 7 to 10 working days. I patiently waited for this but the money was still not in my account. I've been calling them and sending emails but they are not responding. Today, 21 days later the money is still not reflecting on my account. So they have my money and the product which I'm no longer interested in