I had a customer with this problem. They refused to go in a have a heart trap for me too.
SO I used tuna fish to lure them out of the attic at dusk and sealed the hole with a piece of plywood. They got in the vent at the peak of the house.
The next day they PULLED THE PLYWOOD OFF!!! I SCREWED it to the house!!! WOW!! SO I took a 4foot square piece of heavy fence wire with a 1x2 hole and waited a couple days and did the same thing... lured them out of the house with the tuna and screwed the wire to the house... LOTS of screws.
The next AM I went there and ''eliminated'' two big coons as they tried to re enter the attic.
CLEANING there mess was another story!! VERY BAD!!!
CW