There's not much a lawyer can do at this point.  $1600 is small claims territory and it's under the threshold for issuing a statutory demand (which is the starting point for forcing a company into liquidation).  If they are insolvent, then any legal action against them would be stayed if the company is wound up in insolvency - only secured creditors really benefit from involving lawyers in insolvency proceedings.  

It's possible for KenseyCol to be solvent even if CryptoXchange is losing money.  It's not clear at the moment whether or not CryptoXchange is the only KenseyCol enterprise which is being shut down.

While it's definitely worth anyone owed more than $2000 considering issuing a statutory demand if CryptoXchange doesn't start returning funds as promised over the next two weeks, it's probably not worth initiating that process just yet (it has to be done just right and you need to be willing to follow through if payment isn't forthcoming - which means you need to be willing to spend the money to force the company into liquidation).