Spur closes @ 21h45 not 22h00

I got home late to find my area 'load-shedded' so I went to the Spur at Northgate because I know that they close at 22h00. I know this because there is a sign at the entrance that gives the trading hours for the week. I got there @ 21h55 and was told by Brian (Manager) that they are already closed. He stopped me at the door so I promptly showed him the sign at the entrance that showed the closing time as 22h00. He said the sign was wrong and they actually close at 21h45. I asked why they hadn't changed the misleading sign as I had no way of knowing that the closing time was actually 21h45 and not 22h00 and would not have gone out of my way to come there if I had known. I also asked him how myself or any other customer besides myself would know this and he said that is the reason why he is at the door to inform clients of this (in a very arrogant manner). He also informed me that this is standard practice at all Spur steak Ranches. If this is true then I implore Spur to amend the sign displaying trading hours to reflect the correct hours. If not then I have a problem with the condescending and ********* manner in which Brian dealt with me in front of my wife. Are we not customers?