'Misunderstandings'

Nusteel told us they had a meeting with Adelaide Hills Council today at 1 pm with specific people. I rang one of those people at the Council and he indicated there was no such meeting scheduled. He also checked the calendars of his colleagues and supervisor and also found so no such meeting scheduled.
When C rang Nusteel back with this information the Contract Administrator, Tracey said "that's what they told me".
We are starting to have grave doubts about the integrity of this company since we have now had several instances of these types of 'misunderstandings' with them.
What sort of home building process are we in for when we cannot rely on the information supplied to us by our builder? How do we know whether they will build a sound, structurally up to standard home if we are having so much difficulty getting to the point of even starting to build?
I am now seeking advice from Government agencies as to what our next steps should be. I honestly hope that Nusteel lifts their game and we can get our dream home happening but it's not looking good right now!