Yes, as britexpat has said first go to the Rental Dispute Settlement Committee located near Holiday Villa on the C Ring Road. But I doubt very much if the police would be helpful in this matter. Possibly, they may just ask you to approach the above Committee. In the end you may be left with a single option and that is filing a case in the court of law. It may take several months for you to get a verdict from the court and you will need to be present at all the hearing dates. This may prove to be time consuming. The landlords are aware of this, hence their "games". Just hope the Rental Dispute Settlement Committee helps you out.