Dear Sir
1) You could give a police complaint saying that the landlord is harassing you. If the complaint is registered then the landlord will be called to the police station and he will be made to write that he cannot harass you.
2) You can also file a case against him. Its called filing an Injection suit. This suit will not only prevent him from harassing but also he will not even be allowed to enter the house you are staying in. The case will go on for a minimum of 2-3 years.
3) Even if you dont do any of this its not a problem because the only way he can make you vacte the house legally isn by filing a case against you which will again take 2-3 yrs. He cannot file police complaint because its a civil matter and police cannot interfere in civil matters.