Was refused entrance and service

I went to the MTN shop that opened up at the Mall of the South to inquire about a new cellphone. The doors were closed and a notice was stuck to it stating that they were only going to open at 11am due to technical issues. But when I looked inside they were busy helping customers so I assumed they overcame the technical issue. When I tried opening the door it was looked and when the staff saw me they did absolutely nothing. There was no care in informing me as to what was happening. I stood outside that store for five minutes until a consultant finally came to the door and said that they are opening at 11am. I then pointed out to her that they are busy helping customers right now and I just want to inquire about a cellphone. Her response was simply, \Yes