Refused service

I walked into the Cell C store at Blueroute on 31 August at 18:50 and wanted to purchase a cellphone cover. I know it was late but it was only a cover (and wouldnt take long) and I know all the stores close at 19:00. I asked the salesmen to also put the cover on for me and he told me he was going to call someone from the back to assist with this. When he returned he told me that the store is actually closed and that I should come back the next day because they couldnt assist. I looked at the time and told him that I thought they close at 19:00 and it wasnt that time yet. He responded to say that they close early to clean up. If the store actually did have different operating hours then he had the opportunity then to tell me but instead he said that they close early. Im not sure why they had the door open then and I actually asked if I could enter the store. Why did they let me in and where was the sign on the window saying that they close early? I wasnt aware that they are the only store that has the privilege to close early when the mall's operating hours are till 19:00 for all the stores. Cleanup should be after hours. They basically refused to serve me for a sale that would have taken 5 minutes. I wasnt opening a new contract but regardless, it was before 19:00. I honestly think that they didnt have any energy to serve me. On 11 September Blueroute told me that they emailed the store and that they should be in contact with me. I have not heard a word since. I WILL NOT be going back to this store.