If the missing parts are tools or accessories, these are almost always dispatched separately. Give How to: Check on the progress of a delivery a read. Failing that, keep trying with Dyson. If its urgent, calling them usually works best. 

If you’re expecting extra tools, they’ll come via standard delivery. Only the actual products are sent by courier service.

Hi, thanks for answering. I finally got a reply…One missing  item was an accessory and that came today. They will send me the other item in a within 5 days they said. The lack of communication from Dyson got me panicking.

I am having an issue with an order . I have contacted Dyson customer service everyday for a week and nobody will contact me or follow-up. I've reached out every day only for someone to tell me they will investigate it and get back in 24 hours each time