Multichoice - not sticking to their contracts as offered by their staff

I received an offer for the Price Lock plan via email which detailed that I will pay R 529 for Compact, an Explorer installation and including an add on channel. This was also confirmed with the 2 consultants whom I spoken with when taking up the offer. Upon my debit date I was billed in excess of R 800. Upon raising this discrepancy with Multichoice on the first 2 occasions thereafter, I was told that I would be contacted back by the Price Lock (BDD) department with 2-24 hours on each occasion. After more than a week of waiting, and after calling for the 3rd time, today I was told by a manager, Absolom, that the offer did not include the add on channel and that I misinterpreted the offer. When asked why had the 2 consultants who did the application not explained this, even after constantly telling them that I want my packages to stay as it is, the manager did not have anything to say. I am now being told to cancel the add on with my family loves watching or pay the higher premium. Lets be honest DSTV is not cheap but customers cannot be taken for a ride especially with such poor service thereafter. I challenge DSTV to retrieve all my calls made to them for the last 5 weeks and still tell me that I am wrong as a customer. I want DSTV to firstly refund me the difference of the premiums and then bill me the correct premium that was offered and agreed to by their consultants. Good companies offerr good service but great companies have integrity. Lets see if DSTV can stick to theirs.