My sister had them in her attic and a pest control guy fleeced them good to get rid of them.
Save your money and don’t go that route.
Find out where their coming and going from first.
If you have them in your attic put lights up there you can turn on and off and put a loud radio you can turn on and off. Bats don’t like being disturbed And if they are they’ll find a new home. After their gone plug their entrances with wire mesh so it doesn’t happen again.