HELP! Why would a buyer put a house under contract to then only ghost?

[Dakota Mivshek]

Hi all. Currently in a situation that I can't make heads or tails of. Would love any advice. 

So, essentially I had a listing here in Miami that was quite stale and on the market for a while. This strange company called Real Estate Express Acquisitions LLC kept emailing low ball offers that we presented but generally moved on quickly from. After some time, my seller needed anything they could get so we accepted a low offer from this group. Upon acceptance they casually slipped in that they needed me to transaction broker both sides, seller obliged.

Now we are 48 hours away from the inspection period ending and I can't get a hold of anyone. Title has confirmed that they are in receipt of the Earnest Money but despite all my efforts, I cannot get a hold of anyone on the buyer side. After some research I've found some concerning reviews for the 'group' behind this company - the Aaron Organization. 

My questions are: 

1. What is their angle here? 

2. I've sent the cancellation and release paperwork to sign to no avail.

3. How can we get out of this transaction and what do we need to be careful of? This is surely a scam but I can't figure out the angle.