Frustrated with lies by telkom and poor customer service

My copper line was ******. Upon raising a dault i was advised that copper lines will no longer be replaced and i would need to move to smart voice. Sid some homework on the smart voice product. Called telkom call centre and was advised i could either use new telkom sim card phone or alternatively router which I would be able To plug my normal phone into. I opted for the router option. When my order was delivered i recieved the phone and not the modem. Took the phone to telkom store trade route mall where i was told cannot connect phone to modem and sales **** to me. The sales exec laughed at me which made me extremely furious. Was unhelpful and seemed like just wanted be out of the store. Now furious i called telkom support. The support centre advised it can be done. So now im lost not sure if you can or cant do it. Will someone with a little knowledge atleast advise what are My options. Seriously frustrated