Disgusting *******

I ordered a duvet set set online during Black Friday. I paid via snapscan, immediately deducting from my credit card. I recieved an email three days later to say I have cancelled the order. Yet, I haven't. The magic about this, is that when I searched other companies, I managed to find exactly the same product for almost half the Black Friday price. Even the same pictures were used for the adverti*****t. Now, they have not refunded me and I'm disgusted. This is theft. Where can I report them? This is a big company. They should take accountability for cheating people. Where is my money? Nice taking interest from it? I will take tjis to the newspapers if necessary.