The insurance contract was signed by the salesman. The insurance company said: the salesman does not admit it. Insurance companies can't manage salesmen. Let me give the proof and the salesman will sign it for me. That's right. In your case, there is no inversion of the burden of proof, it should be given by you. Not difficult. You just need to make a note appraisal in the judicial appraisal institution. At that time, you can not only claim that the policy is invalid, but also ask the insurance company to compensate you for the related expenses and losses paid for the appraisal.