How can I attach the sill plate to the block formation (contractor did not do it)
If you have the clearance, use a hammer drill with a masonry percussion bit to drill down through the sill plate into the concrete block.  Then use a two-part anchoring epoxy to embed galvanized bolts through the sill plate into the epoxy filled hole.  After the epoxy cures, add galvanized washer, or washer plate, bolt, and tighten down.
You also might be able to use a strap tie, that fastens to a wall stud and the foundation.  Something like this one (from Simpson):