Rude Manager - Poor managerial etiquette

Please can I get a senior manager or directors email address. As your website does not provide this. I need to report the manager of the West Street branch. I went with my mum and son on the 14th May 2021. We always go to this store the ladies are friendly and helpful and the store is clean an has a good selection. This particular day the manager was addressing a staff member at the counter regarding tea breaks but talking to her like she was a dog. There were other customers present. I asked her if she has a office as it's unprofessional to address a staff member infront of customers and other staff in that manner. Her reply was " I'm talking to her not you '" . That's when I lost it. The staff member was in tears a big woman crying she has been working there for a while we know her. I asked the manager her name. She said maya. I told her I'm going to report her she said no problem I don't care. I was shaking with anger I told her you do not treat another human being in that manner because she was starting with the next staff member. I told her you do not break a woman down you pick them up these are someones mothersbor daughter and not dogs. I saw by the reaction by the ladies she has been bullying them . If this is not addressed I personally will go to department of labour. You cannot have people of that nature as a manager. We all have problems we can't go to work and be spoken to like we worthless an be shamed in front of other staff and customers . If there is cameras I can send the times it's happened. I asked her to apologies to the staff member she refused. If it was not covid I would have hugged that staff member.