What can I do if my security deposit is not being refunded?

Question Details: I signed a lease for an apartment with "A Realty" just over 2 years ago. Then, 2 months later, my apartment building was bought by another company called "B Realty" which never sent me a new lease agreement to be signed after the change in ownership. Now, I've left that apartment but B Realty is refusing to refund my security deposit saying that I did not give them a 30 day advance notice for termination: I couldn't because of certain life events happening quickly. B Realty has emailed me the lease agreement from A Realty verbally telling me that lease agreement carried over and that they won't refund me because of the short notice. Can they do this without me ever signing a contract with them? Is the old agreement from A Realty enforceable even though building is now under B Realty ownership and I never signed a new agreement?

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