Security guard being aggressive towards a 12 year old boy

[Guest]

My son often comes shopping with me or my partner obviously with things as they are he waits outside the store out of the way of others the security guard has gone up to him and told him to get off tesco property he was giving him five min my son explained the situation that he was waiting for his parents the security guard said I don't care get off my property as I left the store I see said security guard walking towards my son aggressively at that point I pointed out that he was with me then the security guard walked to me in an agessively and got to close for social distancing and when I said that he told me he don't care just get him off my property I am security and what I say you have to do so I went back in to the store and asked for the manager as the manager came out from the back the security guard was telling the manager that my son is part of a gang that cause trouble outside the store I explained that he is not one of these kid's and that the security guard was not a direct employee of Tesco and gave me the company name contacted the company and they denied that he was one of there security guard's and the security guard would not let me have his name and number I have been told that he is not allowed to stop me haveing his license number I am thinking of videoing him to get his number but don't won't to cause myself any trouble as he has been aggressive towards me and my son without us doing anything towards him