Turning off store lights and closing store 30min early - Consumer Complaint for PEP STORES

I went to Pep in ballito Junction today the 7th of November 2020 at 18:30 to buy a few items for my 1 year old child. 10 minutes later I see the lights were turned off in the store and doors are shut. I made my way to the till point and enquired the time the store closes and the cashier by the name of Nonhlanhla informed me they close at 19:00 and the supervisor on duty said they close as they please so they can clean. It was 18:40 which was very confusing to me as I am a Manager in a retail store and I have never closed 20 minutes before the mall trading times to clean and with my lights off with a customer still trying to shop... I was extremely disappointed and will never step foot in that store ever again as this is the first Pep store I have been to that has said that and I have been to many Pep stores before. I was unable to complete my shopping so I had to pay for my 3 items and leave as the lights were turned off.!