Logistic companies call center?

Firstly such consultant must be authorized agent of US based co. With such authorization how can be delegate work any other person like you. If he shows you any authorization it is better to contact US based company for confirmation. Further if you come to conclusion that he is rightly authorized then you need to execute a written agreement with him duly withnessth by two independent witnesses. After this agreement you can give money to consultant. For more precaution you should also check and take his PAN card copy etc.