With the hold periods on BRRRRs nowadays, your margins will get crushed with hard money interest payments/points/fees. 

Sounds like this is a private money lender or a hard money lender.If you are getting funds from another source and relying on that to close, you should not put in the purchase agreement that you are buying with cash.

We are also reviewing a company that can use it to scan bank statements and tax retturns to quickly sort where money is spent and if documents are fraudulent.

They all are if you ask them , its because they are getting your money .  

I really need to get my money back or pursue legal measures against BiggerPockets .Please advice  Sorry for the inconvenience.

Learning that I prefer money invested in real estate over money sitting in the bank... don't we all?!

I recommend everyone always create their own IRR calculator as they can get pretty complex and oyu will want to understand all the inputs and outputs. we provide a basic one to those in our membership group but I always recommend build your own and understand not only the numbers but sensitivity that lines up with those inputs.If you are hard money lending thats simple as its just a column of dates and amounts for loan provided and monthly interest and points.

I would never put my money into a shrinking population base. 

I recently attended a webinar, Master your Rentals: Save Money and Time with effective Self-management.  

There are always private money lenders there and people who will partner up on a deal.