Incorrect stock levels showing on website.

I purchased goods 30 December. I received order confirmation and payment was taken from my credit card. I sent numerous emails to enquire the status after delivery was expected. It took a further 3 phone calls to learn even though the site showed stock they don't actually have stock. My order was eventually cancelled without the other item which they had stock delivered and just refunded. The service I received was appalling. They sat on my money for which I paid interest just under a month shrugging their shoulders.