How to treat the phenomenon of old people leaning on the old and selling the old?

I am in a small business, mainly selling digital products. I met an old man many years ago. There is a video player on the counter, which can receive TV signals. Old people may think that they have never seen anything, and they are very curious. Then he kept asking about the function and usage of the product, and we all answered him patiently. He stayed at our counter for more than 40 minutes, but he still had many questions.

To tell the truth, the business in the digital store is still busy. Seeing that he didn't mean to buy, we didn't answer all his questions, but went to receive other customers. Seeing that we ignored him, he began to lose his temper at the counter. Yelling that our service attitude is not good. He also said that he would go to the shopping mall to complain about the property, where he would make a scene and affect the business next door. Because we didn't make a clear mistake in this matter, we basically ignored him when the property came. Later, we had no choice but to call the police and let the police handle it.

What happened after the police arrived? Because the other party is older, this matter has also played 20 boards each. We apologize for our service attitude. Where is the old man? He left in a rage.

This is the only time I have called the police in my life. I think generally speaking, the police mainly mediate personal disputes. Anyway, neither side is satisfied in the end.