Terrible Service - Online Shopping

I placed an order that was supposed to be delivered at the latest on Thursday, 27th August. On Friday I have yet to receive any communication about the delay or the actual parcel so I contacted Customer Services (CS) that promised a 24 - 48 hour turnaround. On Tuesday, the following week, I have not yet heard anything back neither from CS or the actual item, so I contacted them again. I received a message back stating that they are paying attention and will escalate the issue to the relevant department. Then today, they just cancel the order with a message saying that the order was cancelled based om my request. This was not the case, nor was I informed before hand. I was not provided with a reason or any additional communication, so I contacted CS once more. According to them they don't have stock anymore. Here is the problems with this: 1) I have not received any communication in this whole process. If I had I could have made changes or got the next size. They would not have lost a customer; 2) I had to drive all the queries from my side, and if I did not drive it it is pretty clear that nothing was going to come from their side; and 3) This is an international company and the CS is not in line with what my expectation is of that. I experience constant and vastly higher quality CS from local and smaller businesses.