This has really exposed the need for education especially for the young ones. The society is going cashless obviously, people need to be educated more to follow up with the growth. It would have been more embarrassing if it were to be someone in the 30s...
I never thought someone can be so stubborn upon the decision of not accepting the cash as mode of payment.
Probably acting out orders from the management either to safe his head/job

The security guard might have assisted by instruction from either the management via phone call from one of the hidden offices around the mall...

such option should stay until one day people accept only electronic payments.
This should be away forward on the cashless cliché until a time will come where users themselves would fancy the use of electronics by themselves and not to be coarced on it.
I'm glad I live in a place where people actually want cash, more than any of the alternatives.
Hey friend, you don't need to be glad over any of it. It is a financial revolution coming, you better get ready to embrace it now and be ahead rather than struggle with it when it will get down to you

Teach your old folks and younger ones now...
Every government has a way of following up with other governments to be better positioned for trade.