MTN staff can't work their computers or call me!

MTN service is absolutely shocking! I called on the 1st and was told the Samsung S6 is R449 per month - I went in store, sat in the queue for over an hour, only to be told it's R500 per month. After speaking to the manager I was told to come back tomorrow. I did that, and when I came back, and sat in the queue for a few more hours, I was told it's R449 but their system says it R499 and they don't know how to change it. This is just not acceptable. The manager then gave me her cell number and said I can call her to check when it's changed. She has not answered a single call or rep**** to text messages. I still have not heard from them. Do MTN want clients or not? They are absolutely pathetic!!!!