Incorrect Billing yet again

I have requested a downgrade from premium to compact. Called in days before the debit order date however I have been debited the amount for the premium package. Needless to say this is the upteenth time it happens and I am very upset. Lets not blame everything on the system because a system was built by a person. I called in 3 times today and on all accassions my call got cut. This is not good service and I would really appreciate this matter to be resolved in order not to happen again. Not only to me but to other people as well. I even spoke to a Team Leader, some Christo guy and guess what? The call got cut. No one even had the decency to call me back to continue with the conversation to find a solution. People upgrade and downgrade all the time and Multichoice should incorporate this into their systems to avoid such mishaps.