Miss communication - Selling products without fully explaining what it entails

I am extremely upset. My father was phoned by vodacom saying that they see he is buying data each month and that they can provide him with a data package which will cost him less per month for his phone, what the sales person did not explain to my father is that it is a new contract and that it will not be added onto his phone, he received a complete new wifi router which has the data on, this means that my dad has to carry the router with him wherever he go's to be able to use the data on his current phone / cellphone number. We immediately phoned Vodacom when receiving the router (We did not open it) to say this is not what my father signed up for and would therefore like to cancel the contract, it was explained that they will come and pick up the device within 14 working days, it has now the 4th month already and we are still waiting for them to come and pick up the device, we have phoned numerous times, we have been to numerous Vodacom shops and to Vodaworld and still they have not yet come to pick up the device, this means that my father is being billed for this contract each month which he is not using and have cancelled numerous times, now they have cut off all of his phone contracts due to not paying this new contract which he has cancelled and now threatening him with emails if he does not pay his account. We are unable to resolve this as now one is able to assist us