Not in mother’s will. Executor was given documents notifying that the property is to be given to me and I have yet to get it. What do I do?

My mother purchased another home after Will was made. She sent documentation by email to the executor advising that the newly purchased home was to be given to me. The will was never changed and the executor signed and sold that house to herself for $1.00 what can I do? (I was living in the home, the executor changed the locks an hour after she died and advised I could no longer live there, that the home was now hers and she gave it to her son. (Executor son)