Bad service from staff and management

Last night I was in your store when it was closing. I had no idea that specific queue was closed. Stood there for a few minutes. Then I realised a staff member was staring at me. She abruptly tells me the queue is closed, because of the way she spoke to me I said that I will not move because I would like to speak to the manager and I did not see a closed sign anywhere. The manager walks up to me and instead of listening to me, he abruptly tells me the that queue is closed. I asked him to show me where that sign is. He said it’s at the at the beginning of the queue. I walk back only to find the staff member only putting the sign there as I’m approaching it. That is not the way to treat clients!!!!!