India Post — thaltej post office postman is very unprofessional when he come to deliver anything

Thaltej post office postman is very unprofessional when he come to deliver anything
Today he was came to deliver pan card and denied to give it to the company owner. He said that he need company stamp to deliver it. And denied to wait. Don't know were to complain about government employees.
Please take action against the postman.
Post office: thaltej
City: ahmedabad
State: gujarat