Complaint letter withdraw from police station

I made a compliant against a person because of using vulgar word's and on me while he was drunked he used to influence the police person with other police person by recommendations later he contacted me directly and he apologized for what he had spoken and he also said that he will vacate my house in 3 months so I felt ok with it and written a compromise letter and taken his sign and kept sign and went to police station now police Si is saying that you can't compromise with him you need to contact me I'll Book case against both of you he is saying like that and he denied to take compromise letter can he file case on me ? Should I need to pay him fine if he files case on me has per his words he saying I'll file petty case against both of you I have recording of tenent abusing me and even CC tv footage that even mentioned earlier in compliant letter why the police is saying he will file Case against me without any bases the accused never came to police station he is giving recommendations on calls to him can you explain what should I do to take back complaint if he rejects and file the case did he has any right to not take compromise letter from me What happened actually in legal way please explain