Unauthorised debit order

On 25-3-15 I received a DSTV Explora for which I understood I would have to pay R799-00 per month from date of delivery per telephonic sale agreement. I could not afford immediate connection of the Explora, being a pensioner, so had arranged for connection on 1-5-15. On 30-4-15 I was debited with R2385-37 and had to cancel the connection.The way I understood this sale is that I would pay the R799-00 per month but it would replace the R772-72 (for my existing HD PVR) as I would only be connecting the Explora later. I immediately escalated this matter to Multichoice who could not give me phone number to Explora sales but gave me the e-mail [Email Removed] who I e-mailed. After e-mails backwards and forwards on 30-4-15, Mariska said she would have to listen to the tape of the sale and come back to me, which she eventually did today. She then said I was told that I would be debited from date of Explora delivery, to which I agreed, but I said I was not told that I would be receiving debits for both Explora and HD PVR and I would never have agreed to that, being not affordable. I believe it was not made clear at time of sale and I should only be debited with R799-00.