Rude behaviour

Just got a call from someone from Vodacom. Providing an option to change my package. I continuously informed the lady that until I see the figures myself I will not make a decision on the spot. However the lady insisted and so did I. Until a point where she hung up on me. Upon calling her back to demand an explanation the number she dialled from is not reachable. This is totally unacceptable and im now becoming fed up of getting harassed and my time wasted by such calls. Please followup and ensure the people you have representing you have common decency and manners and also acknowledge im the client and I have freedom of choice. The call came from the following number: ***