MTN Direct store refuses to assist

Good day. In January, I completed the forms to convert my son's cellphone contract to PrePaid as he was not using his phone regularly. This week we learned that the account was still active. The instruction was given at the MTN direct store in Northgate in January so I fought my way through traffic from Woodmead to get to them before 5pm only to find a note on the door stating that they closed at 4:30pm to do stock take. The official closing time is 6pm. <br> I call the security and asked to speak to the manager. He said no manager was present ... ?? no manager when they are doing stock take?? I waited outside and an MTN person (I cannot call him a gentleman) let a customer out. I tried explaining that I left work early to get there to follow up on the conversion which should have been done at the end of January. He just said he could not help me and shut the door. He was rude and arrogant. The other staff were standing around doing nothing just laughed at me through the window. Previously I've called them and they never answer. I actually don't know why I am still with MTN. <br> <br> They did not do their job in January, and now didn't bother to help me resolve the matter !!!