Burger King refuse customer to make a purchase

Worst customer experience from Burger King Meyersdal Johannesburg. On the 23rd January 2021 I went online to check their closing times which showed 10pm. Knowing there was a 9pm Curfew, I left my house at 7:30 and arrived there at 8:45. I was told by the security lady at the door that they are closed because it 8:00pm. I proceeded to show her my watch time and cellphone time and say it is Not 8:00pm instead it is still 7:50. They were still servicing a hand full of customers inside. I then said to the security lady all the signage on your doors says closing time is 9:00pm. I realized I was getting no where trying to put sense into the security guards explanation. So I requested the manager. The manger on shift told me dismissively they close at 8:00 Which I proceeded again to say your website and the signage at your doors says a different story. To add to that I said I arrived way before 8:00pm so why am I not being allowed into the store. She gave an excuse that there are too many cars at the drive through hence they need to close the doors earlier and rather service the customers at the drive through. This was bizarre as this is not on any policy at Burger King nor is it written up anywhere on their signage. This sort of treatment of customers is unacceptable and leaves a bad taste in my mouth. The Manager seems to make up their own rules when they feel like it and worse the customer experience is the worse I have ever received from a food outlet.