Vodacom is the worst network provider ever

I recently upgrade on a contract, my balance before was 842 so the vodacom consultant told me the new balance will be 941.94 so when i took the upgrade the amount was suddenly after the second month it was 1060. When i complained they said they can change the amount as they please. Now its getting more expensive every month. People stay away from vodacom. They are cheats please. Go to another service provider.