Eviction threat

I am a resident of West Bengal. I am a widow having one kid aged 13 and working in a private company. From January 2024 I am staying at some rented house. The landlord promised me to provide me a copy of Tenancy agreement. But so far he did not provide any copy trickily. The landlord has been paid his rent monthly and he is putting his signature and date against my rent payment monthly in my diary. And he has taken advance payment of Rs 10000/- too. But abruptly he started misbehaving with me and asked me to vacate rented house. Not only that, he brought police twice in three days to force me to vacate. In addition in my absence previously he asked my kid to open the gate in the pretext of common pump repair. In addition he at night calls me over phone to meet him in his chamber to amicably settle-- all of the call records are saved in my phone. I took help from a lawyer who served a notice to him by post but the landlord refused to accept the notice sent by registered post. I lodged a complaint at the po;ice station that the said landlord has neither served me a legal notice nor gave me at least 2 months time to vacate. Now what shall be done as I am unable to look for a rented house in a swift time