What should I do if I sign an agreement with a legal consulting company and find that I have been cheated?

If it is known that the contract has been cheated only after it is signed, the cheated party may apply to an arbitration institution or a people's court to cancel the contract, and the contract will be invalid after cancellation.

People's Republic of China (PRC) Civil Code

Article 147 The validity of a civil juristic act based on a major misunderstanding. For a civil juristic act based on gross misunderstanding, the actor has the right to request the people's court or an arbitration institution to cancel it.

Article 157 Legal Consequences of Invalidity, Cancellation or Confirmed Invalidity of a Civil Legal Act After the civil legal act is invalid, revoked or confirmed invalid, the property acquired by the actor as a result of the act shall be returned; If it is impossible or unnecessary to return it, it shall be compensated at a discount. The party at fault shall compensate the other party for the losses thus suffered; If all parties are at fault, they shall bear their respective responsibilities. Where there are other provisions in the law, those provisions shall prevail.