I AM ASKING FOR ADVICE

Hello, dear compatriots, I have such a big problem renting a room in Renelagh from October with a Polish woman who has a contract with a landlord for 650 eu monthly and all bills as I introduced it told me that the apartment costs 1000 a month where now it turned out that it costs 650 In addition I do not have any receipt of the contract with the landlord, please advise me on what to do in this situation, how to recover the money overtaken by this money, phone no. 0892216129