When the unit requests to provide evidence (proof materials) to the court, the unit shall submit the evidence to the court, and affix the official seal and the signature of the person in charge on the evidence.

The requirement of submitting evidence should not be confused with daily life. Every day, all units issue written materials, affix official seals, financial seals and contract seals according to the actual situation, and have the signature of authorized signatories with legal effect.

What is submitted to the court is the evidence that can be used as evidence at the time of the lawsuit. No matter what the original signature of these materials is, the unit needs to add the official seal of the unit and the signature of the person in charge when submitting them to the court.

Article 58 of China's General Principles of Civil Law stipulates the reasons for the invalidity of a contract, one of which is "the behavior of one party in violation of its true intention by means of fraud or coercion or taking advantage of the danger of others", so a maliciously forged contract is invalid (invalid from the beginning).

This kind of invalidity is absolutely invalid, so this contract has no effect (unless there is a bona fide third party).

Civil matters focus on evidence preservation, and you have sufficient reasons to explain the situation in order to convince the court that this contract is invalid.