Answered this call that called our main office line. There was just silence. I said hello 3 times while line remained open but no one responded so I hung up after 20 seconds.

silent calls. keep calling office and there is silence.

Caller: "Business Telecom"

Salesman calling himself Dean White, asking to speak to the boss (by name) and when I say no, he wouldn't be interested says 'What do you mean not interested? He knows me, I spoke to him last week'.
a) boss does not deal with that stuff and b) he has never heard of this guy or company.
Full of sh*t.

Caller: Nicole From Business Telecoms

Called several times re Buisness Phones & NBN and told to send an email, but yet again called and when told that "I've told you before the process is to send us an email she lied and said that the director had told her to call him"

Caller: Telco/Marketing Company

They are fishing for information. Rung our office multiple times, each person asks a different question. Obviously building a marketing profile.

Hangs up when you question "why are they calling".

Caller: Business Telecom

Wanted to speak to Managing Director, but wouldn't leave a message when not available.