Vodacom Pathetic service

This morning a lady from Vodacom phoned my son saying thy have got a data deal for us on his number, he told her that we are NOT interested and she hung up on him. She then phoned me and told me that my son requested the data deal and they just need my permission because the line is registered on my name. My son was not with me at the time she phoned so I could not ask him if he did request this deal, but she insured me that he did request it and that I must just give permission so I said it is alright. When my son came home so I can ask him he said that he did tell her we are not interested. When I phoned Vodacom to make sure that this "deal" is not put on my account as we do not want it they kept putting me through from one department to the next and saying that I can not cancel the contract with the call center and I must phone the person who contacted me. When I told them I want to speak to the ***** department, because I want to open ***** case against vodacom they said that I must send an email as there is no contact details for the ***** department and they will get back to me within 48 hours. This is pathetic service from Vodacom. I think that I will be cancelling all my contract with Vodacom, because if that is the way they want to get contracts, by lying, I do not want to be associated with them.