The Service is Pethetic

I got an email telling me when I can expect the delivery. The delivery was for the 2nd of May, so I called them on the 2nd to arrange about the delivery and the person told me that the supplier doesn't have stock, so I told him-\Thanks a lot for letting me know". He told me that they will send me an email telling me when they will have stock and deliver. Still Waiting. I received an sms on the 7th at 08:00 in the morning telling me that the order will be delivered that day"