Poor customer service Cell C

My contract was due for a upgrade. When I spoke to the operator I asked that when they upgrade my current contract must be changed so I can top up. She said that it will change on the actual upgrade date. It never happened and I cant top up. Since last week I spoke to numerous people with promises the "somebody" will come back to me. Nobody came back. The first person told me to call Cell C on the last day of September to migrate. The gentleman who I spoke on the 30th said there is a problem and they will come back. The last person said I can only change in 2 years time and she will get the sales person who did the upgrade to contact me. Nobody contacted me to date.