Hi,
You just described our rental situation 3 years ago. Makes me wonder if our rental company changed their name.
Fortunately for us, our rental agreement finished at the same time as the ownership transfer so we did not lose any money. We signed a new agreement and all has been well since then. But, some of our neighbors had lots of money with the previous rental company. Here's what they did to salvage some of it: they went to the police and reported what was happening and showed them the court order that talked about the ownership transfer. They reported to the police that the real estate agent would not return their money. The police made a report and our neighbors took that report to their bank and had their post-dated checks canceled. In order to cancel post-dated checks, you will need a police report.
Hope that helps.