A tenant in Warsaw asked to leave

I am a tenant in Warsaw. If I was told to leave the flat can I insist on staying because my agreement is up till the end of the month? What are the consequences of not complying?

Yes if your contract is until the end of the month you have every right to stay there. There is very little the landlord can do about it.

As long as you have paid for the month - you can stay. If you have not paid - he can throw you out. If you have paid and have evidence of that - tell him to take a walk.