Legal analysis: you didn't sign it, so you have to distinguish what kind of insurance it is, the insured or the insured, not your signature. If you are the insured, not your signature, but the insured is his own signature, then the insurance contract is still valid after you pay the premium, and it is impossible to completely surrender.

Legal basis: Interpretation of the Supreme People's Court on Several Issues Concerning the Application of the Insurance Law of People's Republic of China (PRC) Article 3 If the applicant or the agent of the insured does not personally sign or seal the insurance contract, but the insurer or the agent of the insurer signs or seals it on his behalf, it will not be effective for the applicant. However, if the applicant has paid the insurance premium, it shall be deemed as his approval of the act of signing or sealing on his behalf.