Do you have a copy of the will, or at least the portion where it says you are to have the TV? Or even something signed by Doug's father stating the facts?
So you have something to show them as proof?

You might able to get a no contact order.??
{ not sure if that is the right name for it}
But for sure keep calling the cops if they bother you again, maybe they'll get locked up for drunk and disorderly.