An answering machine responded to the above number stating that the organisation was Sangrove or Sand Grove, or Sam grove (as the female voice was indistinct). They have called numerous times, especially whilst I was overseas and did not wish to answer calls from Australia. My phone indicates the origin of this number as being Margaret River

Mick, I work at Millbrook Winery in WA and can confirm this definitely isn't our number! After contacting our head office, we've determined this number doesn't belong to any of the businesses under the Fogarty Wine Group name, and will be getting to the bottom of why they are contacting people.
On behalf of Millbrook Winery, I apologise for the inconvenience caused and hope it hasn't put your view of us in bad light!

Milbrook Winery in WA. Tried calling back but just got answering machine. They've called every day now for about a week. As soon as I answer they hang up. Sooooo annoying.

This is Hayshed Hill wineries in Western Australia.  They will only call you if you have signed up to their database.  But they dont leave a message.