The agreement you signed with the agent would control whether or not you may have a claim against the realtor. It is likely that you agreed to have your numbers released to other realtors when you signed the agreement.
I agree with Attorney Avramski. Check your listing agreement to determine whether your realtor was authorized to release your phone number.
Please note that I am answering this question as a service through Avvo but not as your attorney and no attorney-client relationship is established by this posting. An attorney-client relationship can only be established through signing a Fee Agreement and paying the necessary advanced fees.
Even if the agreement didn't authorize release, I don't see significant damages here. Even if you won, I don't see you recovering enough for your attorney fees.