Over a month and still no refund

An online order was placed at the end of October. After being informed that the product was out of stock, I received an email to say that I would be refunded. After weekly follow ups I was informed today that there was a back log of payments and that they could not say when the refund would be processed but it would be approximately a month. Considering that I made a credit card payment, I find it completely unacceptable that now have to pay interest fees because of Boardmans. To add to my dissatisfaction, they are incapable to provide me with feedback/updates which means that time/airtime is being wasted on this. I am extremely unhappy with this.