That sounds like poor service from the lease company. The stages (as shown on the tracker) are as follow:
1: processing order - as it sounds.
2: with the factory - parts are being ordered and are awaiting supply dates
3: BW confirmed - all parts are at factory and they've confirmed a date for build.
4: Build in progress - as it sounds, although very often skipped on the tracker as actual build is only a couple of days. States is takes 4 weeks from start of build to delivery.
5a: in transit:left the factory - on it's way to Emden.
5b: in transit:shipping - at Emden waiting a boat. Normally received 48 hours after 5a.
5c: in transit:nearly here - on boat to either Grimsby, Tyne or Sheerness depending on dealer location. At this stage VW can give you the name of the boat, but it sometimes skips this stage. Now states 10 days to dealer.
6. Arrived in the UK - as stated, takes up to 10 days apparently, although they try and do it within 7.
7. At dealer - just needs PDI and valet and is ready for you.
Tracker isn't too accurate, but VW customer services can give a better idea of what stage it is at. If you speak to VW UK direct they may be able to find the dealer and car for you, but push the lease company for an order number.