hello i have encountered such agents before and i refuse to buy from him.
i have the following suggestions.
1. write to the straits time abt your experience.
2. write to feedback@saea.org.sg. this is the authority to lodge a complain against agents.
i have spoken to a lawyer before. basic of law is simple, u have have done work to deserve payment u can verify this by speaking to one yourself. there are a few pro bono services by the legal bodies that will give u free advice. if there is time, talk to one of them now. they can advise you on this deal. agent does not own the property the seller does. the agent is only a proxy to the owner. unless the owner refuses to sell the flat becuase you dont want to pay the agent, that is another story.
i think the once the otp is signed, the owner must let u consider for 14 days and he cannot offer to someone else it will be a breach of contract. i only hope you kept a copy of the documents.
actually i wished you had not left the house and called the police instead. if the agent gets into a brawl or threatens u, u might have a case against him. only the owner can thrown you out, the property belongs to the owner and only he can evict you. the agent does not have legal right to throw you out.
i am currently looking for a place of my own and if i encounter such agents they can expect me to get even, including getting a lawyer to kick his ***.