This sound's unfortunate. The previous owner of the estate, Paul van Vlissingen, was very pro-access but his keeper has always had a reputation for disliking walkers. I've no idea if that keeper is still there and responsible for this action, and Paul died two or three years ago. Not sure who owns the estate today. However, this is contrary to the Land Reform Act and I would send a complaint to the Access Officer, Highland Council, Glenurguhart Road, Inverness.