I called back number (02) 5519 6056 reached voice mail for a company called Clever Contacts.

Telemarketers working for a company called Clever Contacts they got very pushy and disrespectful once I said I wasn't interested, I hung up and 10 mins later they called back I didn't answer it and they called another 7 time's.

got a call from these people too - googled and it's a telemarketing company