Telkom Lacks Consideration to its Clients

We received via courier a "new" Wifi phone. Our previous landline was immediately disconnected without any prior advice!. As there was no contact from Telkom I managed to link the phone to my internet. We live in a two-story house so I needed an extension upstairs. Telkom said that they are only responsible for one phone. Telkom, Game, Incredible Connections do not have phones compatible with the Telkom system which I can use as an extension phone. Why introduce a new system without allowing for the provision of Wifi units which can be used as telephone extensions - even at a cost to the client? Telkom has provided a disgraceful service and support to private clients!