Although I am not sure what a "title plan" is, the way to determine the location of the boundary between your property and your neighbor's is to have a survey done. If the survey shows that your neighbor's fence encroaches on your property, you can bring actions for trespass and for ejectment. Consult a surveyor first, then consult an experienced real estate lawyer in your area for advice on how to proceed.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.