Follow the general rule that I have when it comes to social media accounts, where there is doubt, stay out.
If there is a very big disconnect between their analytics and a third-party audit site you might want to skip it.
As much as possible try to go with offers for accounts that feature analytics data that is in line with third-party audit sites.
Maybe your situation is a fluke but depending on how much money is involved it might not be worth the risk.