Unprofessional behavior and incorrect advise

I bever complain on such forums, but DSTv is driving me insane. It is not about the money, it is a principal thing…. From what i can see, DSTv wont even bother to rectify or assist but lets see

Long storey short, phoned Multichoice twice before installing an additional decoder. They confirmed that i can go ahead and the additional fees is already included in my package. I went ahead with the installation and now… surprise surprise i am being billed extra. Phone back twice and apparently talked to a line manager, Benjamin, who could not help and then when i asked for a reference number, he put the phone down in my ear. Really considering going legal because this is completely unprofessional. How many people do they catch this way?? Giving incorrect advise and then refuse to assist???