STILL AWAITING A REFUND NEARLY 4 MONTHS LATER

My graphics card died while still under warranty. I sent it back on the 23rd of September. The company received it on the 25th. I was told that as the supplier did not have any stock of the model in question, I would be receiving a refund. I waited for my refund, which did not materialise. I phoned the company, only to find out nobody knew where my graphics card was. I sent proof that I had sent it. It couldn't be located for a while, and the only reason I knew is that I had to phone every 2 days to check the progress, as no one ever got back to me. Finally, on the 23rd of December, I received an email saying my refund would be processed. It is now the 9th of January and I still don't have my money. I am now having a Public Freakout (TM) as talking to anyone in private clearly has no effect.