downgrading from 20Mbps to 10Mbps

So i decided to downgrade from 20Mbps to 10Mbps as my speed was only on 8Mbps , not knowing that Telkom will charge me an amount of almost R3000 which i had no idea of the cancellation charge and non of Telkom consultants contacted me and advise me on downgrading and what the chargers would be . I am disgusted with Telkom services and feel like cancelling all my contracts with them , i also wouldn't advise anyone to join Telkom !