Cancellation by TFG/@Home but no refund after a month!

Awful experience with @Home/TFG - I ordered 4 furniture (order p***3) items on 22 March, but only 3 arrived. I was then informed on 8 May that the remaining item was cancelled - no explanation, and I’d get a refund in 3-10 working days. It has now been a month and I have received no refund. I ordered another item from @Home, which was delivered but I do not think it fair that I had to pay for Delivery again. My ask is that I receive my refund as promised, and the delivery fee refunded, or else I will never shop at @Home or TFG again. I understand that the lockdown has wreaked havoc, but customers should not be left hanging on refunds for this long!