EXTREMELY BAD SERVICE

I have a contract with Vodacom for years now. I've also added my son's number to my account. I phoned Vodacom last November to inform them to cancel his data bundle contract. they've assured me that it has been cancelled. Well not so!! I'm furious and frustrated with them. I called their customer service centre and spoke to so many consultants. None of them could assist me. Now instead of my account being less because of the cancellation, it's MORE!!! I got a ref number from one of the consultants and a manager was suppose to phone me back on Monday 11th Jan. Today is the 21st Jan and no phone call from Vodacom. Extremely ****ed of with the bad service!!!