Documents presented to the Czech authorities must always be obtained through official channels. If you use so-called intermediaries, you run the risk of obtaining a false document.
Documents submitted to the authorities must be obtained only through official channels at the relevant places (e.g., embassy). We strongly caution against using the services of so-called intermediaries who may offer to provide you with documents for a fee. These documents may be forged. The Czech authorities verify the authenticity of the documents presented.
You are responsible for the authenticity of the documents submitted. If a false document is presented, the Foreign Police will be called to deal with it. If the document is for example part of an application for a residence permit or its extension, your application may be rejected.