If anyone can help woththis,please reach out : My father owns a business that has been family owned and operated by my grandpa and my father for nearly 50 years

If anyone can help woththis,please reach out : My father owns a business that has been family owned and operated by my grandpa and my father for nearly 50 years. The name of the business contaibs our last name. The google street view of the business is my fathers home. Recently my fathers domain registration lapsed and someone bought the domain. We changed the website to a different address and went to change the google listing for his business only to find that someone had also claimed the business. We have tried requesting ownership, we filed a formal 3rd party dispute, and we have requested a domain change. Through all of this we have just been completely ignored by google. I cannot figure out for the life of me how to get someone from google to help us verify his ownership of the business. Its had a real impact on how many calls he's getting for work and has created financual hardship for my parents and there is seemingly nothing we can do about it. If anyones been through this or something similar and has advice please leave a comment. Any help is greatly appreciated.