2. If I didn't sign it, but the company stamped it, and finally I didn't want to go to Company A, it wouldn't be a breach of contract. Because you didn't sign it.
I fill in my personal information. Party A (Company A) stamped it and sent it back to me for re-signing, so I don't want to sign it. This will not constitute a breach of contract.
You didn't sign it, and the contract hasn't come into effect yet.