Total and complete disregard for the contract to sub-lease vehicles (as well as boats and air craft) so that the payments could be made by a new, short term user.
It is obvious that this company was set up with the intention of steeling cars directly (and willingly!) from the current (and still financially responsible) owner.
No communication via phone (several numbers, all changed over the last weeks), email, fax or paper mail. They also new that with a contract, the police would not look for them!
Have multiple documents, 20+ page contract, insurance and the early emails. Have hired attorney, considering private investigator.