A large crow was bouncing on my large chimney cap recently and knocked some of the mesh wiring off the cap. This in turn resulted in a bat flying down and coming out a heater vent in my basement. Now, I am debating whether to call a chimney sweep or a roofer to fix the cap and/or install a new chimney cap-roof-top damper combo because my wood-burning fireplace, which I've never used, does not have a damper. The flu, which I had inspected before, is just stuffed with insulation and a board. Do roofers do this work or do chimney sweeps and if so how would you protect yourself from scammers if you are not on the roof too and cannot see the problem yourself? Thank you.