Verify the work of app developer to see if he's lying or really needs that many hours for each task

Job ID: 38500945

Budget: €30 – €250 EUR

I've hired a company which developed mobile app for me (ios + android) and desktop (ios + windows).
There has been several months since last version update, now the new version came and they sent a bill with over 200 hours of work to be paid.
I need skilled person with extensive knowledge and experiences to compare new version vs previous version and go through list of all tasks that were completed and hours each of these tasks took (I have the list) and tell me if they're telling the truth or they're lying and are trying to scam me out of money.
They didn't only work on app and desktop but also other parts so your knowledge to be able to understand and verify their work needs to be wide. Your knowledge also needs to include Firebase, Api Dev, HQ user management, Landing.

$100 is what I can pay for such check and to also ask you some questions regarding these topics so we can get a clear answers on which way to go further with our apps.