R55 Nando's manager threatening to beat customers

So last night I experience the worst kind of service in my entire life. My wife and I walked into R55 Nando's ti get us something to eat whilst we are on the queue the store manager/supervisor was arguing with one of the customers. Mr. Customer then wants to share his story with me while im waiting for my wifecto place her order and I listened to the old and as he was talking to me the manager then interrupts us by saying i should listen to the guy because he wants to mislead and I politely asked him to exclude himself from our cinversation. The manager continues ti interrupt us. The next we are now arguing with him and he is so angry that he threatens to physically fight with us, he is actually restrained by the staff members and it was just war. The funny thing is that we had to be moved outside the store so that he could not fight with us. He even took off his work uniform wanting to fight with me and we were made to wait outside with the new manager and he explained that it was the guy's last day in the store abd i guess his behaviour. I personally feel that the management if that Nando's are liable because how do you have someone so rude servicing customers and fighting customer, can you please review your vidoe footage then revert.