Migration complaints

Last month during March I visited Germiston MTN store to get advise on which best package I can be migrated to the cheaper package and I explained that I'm on my choice R350 top up,monthly invoice R749 wish I couldn't afford either. The sales lady advised of my talk 500 minutes and I asked her if I would be paying only R500 no other charges to be expect and she agreed. To my surprise my 1st statement was emailed and I got a shock of my life to see the total invoice of R946 and I immediately contacted 808 and explained my problem and I also made an arrangement to settle the other balance of R400 as it wasn't budgeted for as was promised amount of R500.00 only. I was then advised to go back to the store and when I got there, they seemed surprised that I was charged more. She was still insisting to say I wasn't suppose to be charged that much I called 808 while at the store and Themba Ntebi ***.he confused me worse but concluded with Sales lady who was advised to log fault USD499572 for reversal of package to R350 top up with no charges.