Misleading - Telkom / Mobile Talk

Mobile Talk contacted me and misrepresented themselves as being Telkom. (whether indirectly or directly). They led me to believe that my current cellphone contract is due for an upgrade and suggest that I \upgrade"to a cheaper contract and that I would still have all the benefits of the existing contract. I received a sms from Telkom with balance due amount. I requested a statement and saw that I am paying for my existing contracts"