House of Fraser - Order not delivered

I placed an online order on the House of Fraser UK website a week before Christmas. Foolish I know considering the issues with the company recently, but i thought ordering off the UK site would be fine.

I paid using Revolut and expected delivery sometime before or after Christmas. I received tracking emails in the week before Christmas saying my order had been dispatched etc etc. However it never showed up at all, and when I tracked it after New Years day it said the package had been returned to sender. No attempted delivery or anything, just returned to sender.

I hadn't heard anything from House of Fraser about this, and have received no refund. I have emailed their customer service multiple times now with no response (bar auto-reply).

Is there anything I can do about this or should I just give up hope of a refund? Can't get over the awful customer service - I did consider twitter but they dont seem to have been active on their twitter page since the Mike Ashley takeover in August.

Any advice is appreciated!