Though I can’t speak for casting services (yet), let me speak up on
my understanding of communication - this was how we did it in
military aviation [long version]:
Communication requires three steps (unless under emergency
I make a request
You reply with your version (understanding) of the request
I confirm (and close the connection if all is consistent)
Without these three actions, communications did not occur, and the
resulting actions will most likely be wrong. (This does not apply to
rules of communications under emergency conditions!)
If #2 does not reasonably match #1, then the communication was not
satisfactory, and should be so noted in #3; further negotiations
should follow, patterned on the communications rules.
If #3 does not occur, then communication is not satisfactory, and
further actions are required by both parties.
Sounds to me like the vendor (#2) did not respect the third
requirement, and acted with an improper understanding of the message.
If you did not “close” the communication, then it should have meant
the vendor should not have begun casting until you had agreed to what
[short version] They screwed up.
OK, I know there’s no good advice here, but hopefully it will give
you courage to plant your feet & deal with this as a strong person.
Challenge the communications process (keep good records, photos,
etc_) and work towards an equitable solution. Equitable means all
parties bear a responsibility to communicate properly, and will
accept negative consequences if they fail.
Own up to what you are responsible for; hold them accountable for
what they are responsible for.