LIKE THIS, chat box right lower.
They told me they work for facebook, I cannot currently prove they do or don't. So I asked a lead question. A normal response would have been, give us a call and we will transfer you to a manager. Or, I do not know that, and then they would give me a phone number and an extension. Instead "alex" a commonly used name by tech scammers leaves the conversation.
So, lets prove, they absolutely do not work for facebook. Because if they don't, its open season.