Awaiting refund for part paid upfront and not in stock plus refund for courier fee paid upfront.

On the 2 July I emailed Home of Living Brands (HLB) to order a Russell Hobbs part. After many emails later I paid for the part and the courier fee on the 29 September. On eat 3rd October HLB emailed saying that the part was not in stock and they could not get stock. Naturally I requested a refund and send through my bank account details and confirmation of bank account. To date 14 November I have received no response to my numerous emails chasing the refund and have not received the refund. I am also unable to reach HLB by phone. The service call centre does not work. Dreadful customer service. Please urgently refund.