Mbile Talk giving false information!

Yesterday my father was phoned by Mobile Talk representing themselves as Telkom! They offered him a service which he did not understand regarding a \wifi\" ADSL. Besides not having explained the service to him, they also informed him this would \"replace\" his existing line as it is much faster etc etc. They promised him an email explaining all the information should he want to sign up. After not receiving said email, I have phoned them to find out that he \"telephonically agreed\" to this service for a LTE device with a 20gig cap. Besides giving him the wrong information, you cannot sign someone up for a service without allowing them to read/sign the correct documentation, also he did not agree to this service as he thought he was being sold something else and would get information first. They are now also telling us that the device will be sent to us and once signed we will only be billed. We will not sign for this and refuse you to bill us for this, they are also playing hard ball and do not want to cancel the \"contact\" I suggest a supervisor or management sort this out before we contact a lawyer."