Notify your customers

Very disappointing in there service following my last ordered package. There inability to notify you that they don't have stock is shocking. How long does it take to notify a customer that you don't have stock? I received 1/2 packages that I ordered and when I went to follow up I saw that they emailed me saying that they don't have stock, but should that email not have been sent before I was told that my package is on its way, no on the same day I receive my package. How can this be acceptable for a company as large as Takealot? I know there where email server issues at a certain hosting website at the start of the week but for a company as large as them not to be able to notify a customer beforehand is strange because I got there daily deal emails so that was working. Should I in the future just hope that I will receive all of my package that I ordered?