10Mbs line gets 2 Mbs speed or less

Lat month Telkom reps came to the flat and convinced us to move to a 10 Mbs line from a 4 Mbs because we complained of low speeds. Forms were completed and obviously the monthly payment went up but the speed remains the same. When you call Telkom, you hold for over 40 minutes listening to voice prompts. How is this fair to us as consumers? You could have just raised the tarriff and promised nothing really. This is soooo unfair as we are paying so much money (cose to R800.00) every month for this line which is supposed to be ADSL by the way.