Dissatisfied and disappointed

I placed an order on the 27th of November, the expected date of delivery was the 20th of December (why that long, who knows?). One item, a mere book, went out of stock and was delaying the whole order from being delivered. I called today (12 December) to find out if my order can be delivered and the one item be sent later when it's available. I was told that could be done. Great! I check on the app and the new expected date of delivery is the 28th of December. I call back because I just don't understand where the breakdown was. I talk to a lady who tells me that her colleague made an error and now two not one of my items need to be cancelled in order for me to get my order at a reasonable time. Yes it is one book and a dvd but there are reasons why I decided to pay them, and I am being told they'll have to be cancelled. I am truly disappointed. This is not the first time your company has failed to deliver on little things that count for customers, but somehow we give you a chance to redeem yourself and you never do.. At this point after whatever is delivered (barring anything else be cancelled off my order) I do not believe I will purchase anything from you guys again. There really is no point.