I work through a “client” who is threatening to cancel my visa. He also says that I cannot work anywhere else with the visa I have. Is this true?
If you work through a “client”, he may, under certain conditions, revoke your work permit or deregister you from your place of temporary residence in the Czech Republic, but he cannot revoke your visa. If you have a work visa (visa 61), you also have the right to work in the Czech Republic without an intermediary (“client”). However, if you have given him power of attorney to act on your behalf with the authorities, you should notify these authorities in writing that you are cancelling this power of attorney.