I opened an account, a Solo 401K IRA and completed the transaction.

It's a 4 family, I just don't want that kind of transactional relationship with any tenants.

Do they suggest how to enter the transaction accurately or enter an adjusting Journal Entry.

The sooner you regain control, prove that you fully intend to enforce the terms of your lease, and that you will not be 'played' by their recall of events or documents, the more effective this action will be.  

What are the most effective ways to exit an investment? 

I think what you’re referring to is a checkbook IRA so you can bypass the custodian when performing transactions/investing and all assets/accounts will be held in the name of a special purpose LLC or Trust which is the instrument that gives you checkbook control.  

No one will be losing any commissions besides the broker who is negotiating the transaction for you  

Of course our big motivation is commission but you can get commission or a referral fee or something in an off market transaction if done properly.

I am not in the flipping market but I handle multifamily transactions for buyers and sellers who are very transactional.

You will have a leg up on the language, transactions, inspections etc.