Maharashtra Natural Gas [Mngl] — no card payment unofficial staff attending customer

Address:

Pune, Maharashtra, 411005

I fill up my car gas at mngl shivaji nagar every timeme. But whenever i visit there i see unofficial people serving at gas station. They always refuses card payment and ask for cash payment only. After cash payment they do not return remaining cash and if we questioned them then they starts arguing.
I request mngl corporation to take some serious action against this situation.
Thank you