I ordered two T-shirts, and only one item was delivered

I ordered two T-shirts, and only one item was delivered. When I contacted the courier, I was informed that they only received/collected one item from Al Capone. What makes the situation even more disappointing is that Al Capone never communicated with me to inform me that the second T-shirt was out of stock. My order was confirmed for two items, yet you proceeded to send only one without notifying me or explaining the situation