The landlord explicitly stated that after tenants leave, he would inspect the cleanliness of the room and return the deposit only after that. I initially tried to negotiate with the landlord, but he insisted that there was no such procedure and emphasized that he wasn't trying to cheat me out of a small amount of money. Although I had some doubts, I did not pursue the matter initially, assuming the landlord was a good person. However, to avoid being taken advantage of, I kept a record of tenancy evidence, the landlord's information, and the local police station's contact details. Currently, I am away from home, and if I need to take legal action, where can I file an online complaint?