Wrong deal loaded leading to incorrect amount due

I app**** for the DSTv explorer special deal for R799 from DSTV DPP, department which was approved in March 2015. The DSTV explorer was delivered on 7th April 2015. On the same delivery date I called DSTV call centre to activate the decoder. I explained clearly that I am an existing premium subscriber and I want to activate the explorer (R799) as replacement to my existing subscription. The lady I dealt with activated the explorer, but at the end of the call she said amount due on my account was R1001 because she has processed some pro-rata amounts. I challenged this but she couldn't answer me (kept me on hold for a long time and did not come back on the line). My second call to call Centre was to activate my extra view. Again I inquired about the enormous bill, again agent couldn't answer but promised to escalate to DPP. Finally in the evening a call centre agent managed to inform me that the package loaded on my profile is (R750+R99 = R849) not the R799 I got approval for!!!. Matter to be escalated to DPP for resolution. Can someone within Multichoice please resolve this matter urgently. Today I spent more than an hour on my cellphone attempting to resolve this matter, NOT OK!!