Misrepresented services

I received a call from Telkom promoting their ADSL router/data contract. I declined as I indicated not able to maintain a contract since I'm a real estate agent and funds not regularly on a monthly basis. The consultant reassured that it's a pay as you use contract and explained in detail service used for the month I use is payable. We accepted promotion offer based on what was explained. We utilised service for 2 months and when we received our commission we contacted first Telkom in Kenilworth centre to ask for our statement of account. To our shock it was not the amount we calculated for 2 months but the months added we did not make use of service. We asked for explanation of statement and was told to email Telkom customer service. We shared all the information given by consultant including voicenotes. We received no joy. The email we received from Telkom was that we should settle account to date and further investigations will be done. Telkom customer care is not helpful and the service offered was misrepresented. We know sit with a billing we indicated we could not maintain due to our income and could negatively affect our credit profile. Telkom is not honest in promoting their services offered and actual billing process. Please beware