Honestly, without seeing it, and exposing some of the behind the concrete work, I really can't say.

But it is not uncommon to mismanage rebar and/or wire mesh. It is very, very unprofessional however.

This only intensifies my suspicions that you REALLY need to do some hard-core investigation AND 'lawyer up'. Like I noted, guys doing that sort of work in my area change LLCs about like they change underwear . . . and for the same reason: they are too full of 'mess' to use any more!