Question: who can I write a complain letter to my land Lord. ??!!? 

Answer: Maybe I misunderstood your question, sorry, but if someone is harassing you in your neighbourhood, you may be better off contacting police.  I am sure police will contact your landlord if they think he/she is negligent. When the officers talk with you, you can ask them if you should complain to someone about your landlord and how to do it right. You deserve to feel safe in your neighbourhood. Good luck!
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