It has not taken effect. For the unit, the seal is a necessary condition for the contract to take effect, but the signature is not a necessary condition.

The corporate legal person is a fictional personality. Therefore, it has its own rights and abilities, which cannot be exercised by any individual. The performance of its behavioral capacity and rights when signing a contract is the official seal.

When you sign a contract with a natural person, as long as the other party signs it, it means acceptance of the promise. When you sign a contract with a unit, organization, enterprise legal person, public institution legal person, or agency legal person, the official seal represents the promise.

Moreover, the essence of the so-called sponsorship contract is a gift contract. The donor has the right to revoke the gift contract at will before the movable gift is delivered and before the real estate gift is registered and transferred.

Therefore, even if the contract is established and effective, the enterprise, as the donor, can revoke the gift contract at any time before delivering the donated chattels (such as cash) and will not be liable for breach of contract.

After the contract is revoked, it is invalid from the beginning, or in this case, the contract cannot be effective if it has not been established at all. The opposite party (you) can only claim compensation for contracting fault, but not compensation for breach of contract.

You may require the other party to bear the contracting fault in accordance with the provisions of Article 42, Paragraph 3 of the Contract Law. However, negligence in contracting only compensates for the direct costs incurred as a result of the conclusion of the contract.

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Legal basis: Contract Law

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(Contracting Negligence) Article 42 If a party commits any of the following circumstances during the process of concluding a contract and causes losses to the other party, he shall be liable for damages:

(1) Pretending to conclude a contract , conduct negotiations in bad faith;

(2) Deliberately conceal important facts related to the conclusion of the contract or provide false information;

(3) Have other behaviors that violate the principle of good faith.