My realtor hired a professional before I put my house up for sale to tell me the issues I had. I received a professional paper stating all of the issues. I even tested for mold, I think it was $400 and I got a professional paper stating that I had no mold. This shouldn’t be complicated. I think he has a shitty realtor.
Also, I would never pay for service that cost more than $500 thru PayPal on Venmo. Invoice a must and check or credit card only because both protected (if you have stop payment on check). Venmo… once money sent, you are on the hook if you got screwed.