This sounds as if there may be an agreement between the broker and agent that leaves the listings ownership in the hands of the listing agent and not the broker. Seeking a clear appreciation of the role of the broker and agent with regards to listing ownership would be important to understanding your options.
Whatever you choose to do make sure you speak with this current broker clearly to be aware of the entire situation and your obligations to this broker if any.
However, they should have notified you and explained the situation to you before terminating the listing. If there is nothing in writing between you and the broker, I would strongly suggest you interview other brokers that may have your best interests at hand.
Best with your situation!
Licensed Realtor in NJ and GA
contact me and if I can't help you I will get someone that can.