This is a land investment company called L.A.G. (Land Assests Group) although they will use various other names such as Plott Investments.
They are trying to sell you land.
They will probably have your name and names of others you live with (Electorial list?) and they will probably ask you to confirm your home address. DON'T!
Once you answer they will keep phoning you with other 'offers' on land, bottles of wine, etc, etc, they are like a Rottweiler who just wont let go.
Needless to say don't give them any information, just tell them to go forth and muiltiply.