No update or follow up

Last week Tuesday I was contacted by Cell C. I took up an offer from them on a Samsung Galaxy Prime Core device. I was informed that delivery will take place between 5-7 working days. Today on day 6 I phoned to find out how far is my device. I was only then informed by the consultant that assisted me (not the one doing the transaction) that the device is out of stock and there is a waiting list. Now how do you sell something that is out of stock and why do you not inform your customers atleast? Now, Cell C please cancel this contract before we even start it. If the service levels starts of like this, I don't want know how it will be in the future. It was my original plan to move over, but after this I'm glad I didn't.