@home Online cancelation and refund process

Extremely disappointed with the online shopping experience. I understand that there was a back log to delivering orders so I opted to cancel my order. This was done on the 21st May 2020. After supplying my bank statement upon request, I am yet to receive my refund. I have been trying to contact them via email and telephone with no success. I have never experienced this type of customer experience before and especially disappointed that it is received from such a reputable retailer.