Black friday special not fulfilled

Black friday sales and specials has a poor commitment from RARU. Bought a deal advertised for a 4tb hard drive, order was placed and paid for. Today I get an email stating this order has been cancelled as the supplier does not have stock of item. They will however, credit me for future purchases.

This was my first purchase with RARU, and if this is the start of such a relationship, it is ending very quickly. I request for a refund back to my credit card and hopefully this will be done.