I hate to say this but this is a common thing, especially with getting
rebuilt engines from VW.  I would see if your dealer (or maybe another shop)
would just get a rebuilt engine from another source (Boston Engine or AVP are
both good rebuilders).  You can get the engine through me from either of
these sources at a discount as well.

A couple that were a customers of mine broke down last summer and the shop
where they were stranded (in PA) insisted that they get a rebuilt engine from
VW.  So they waited and waited for a few months while VW kept promising the
engine and it never showed up.  Finally the shop gave in and they got a
rebuild from AVP and where on the road.
Ken Wilford
Van-Again
John 3:16