In my state if a landowner is going to run a high fence hunting (pay to hunt) operation they must attempt to drive out all the deer inside before they close the fence. If they are just fencing their property and not running a pay to hunt operation they do not have to do anything. I suspect the other landowner was using the property you bought to hunt on and now he is making sure no one hunts his property. I also suspect that the seller and Real Estate were aware this was going to happen and failed to disclose it to you. Talk to an attorney, you may not have to pay anything just to asked him if you have a case to get your money back or buy a good wire cutters.