Waiting, waiting, waiting ... for emails and parcel.

I placed an order online, and paid on the 29 November. I received ONE email stating that a tracking number would be sent, and an SMS. neither happened. The company now claim they sent an email with tracking number yet why haven't I received it ? I can show screenshots of my INBOX, Junk emails etc. The courier company cannot tell me when my parcel will be delivered (second day in a row) How is it, that the company can state they sent an email yet its nowhere to be found ? So now its apparently MY fault ? Quite unreal. Here I sit. Can they furnish proof of delivery of the email ?