What steps should I take if my Thai visa extension was obtained through a fraudulent agent?

The user is facing a serious issue with a three-month fake Thai visa extension obtained through an agent. The community suggests several actions, including reporting the agent to the police, visiting the immigration office to disclose the situation, and possibly consulting with a legitimate visa agent for assistance. It is also recommended to gather any available evidence of the forgery, such as documents or stamps, to present to immigration authorities. The conversation highlights the importance of choosing credible visa agents and the potential consequences of using fraudulent services.