Is My Former Landlady Allowed To Harrass Me The Way She Is?

Me And My Partner Moved Away About A Month Ago In To A Beautiful 2 Bedroomed House And Since Then We Have Been Harrassed By Our Former Landlady By Phonecalls, Knocks On Our Door And My Partner Has Had Visits At Work By Her. All This Because Of 2 Weeks Rent. We Told Her To Keep The Deposit As We Dont Want Anything To Do With Her Anymore. At This Moment Im On The Verge Of Legal Action What Can I Do?