Not a happy customer

I took advantage of the Black Friday deals and thought of spoiling my family, online shopping would be the easier way. I placed my order: ********** 19. On 30 November I received a email, that one of my items are out of stock, while there was stock when order was place and I paid Visa, so my payment went through immediately. I was credited for that item, but what I am upset about, is, if I want to purchase that same shirt again, I will have to pay full price. Please explain that too me, when I purchased (stock available) paid Visa, payment reflected straight away, only 4 days later I am notified by email, that the shirt is out of stock. I am a very upset and despondent customer at this moment.