Do not trust DStv multichoice

Dstv called convincing me that if I join their 24 months contract my monthly payments will decrease a bit and I agreed . I have dstv compact and access on my name which I didn't have a problem while I was paying cash. Now this 24 months they'll deduct via debit order, okay fine I gave them authorization to deduct monthly on the 3rd R409 for compact and R115 for access.

Until last month I see I'm now owing R1663 and I called them asking why this amount? They told me it's a system error they gonna fix it. Until it decreased yesterday to R1443 I called them they told me they trying to fix it it's on process. This morning they blocked my channels I see I must now pay R1119 that I don't know where it comes from. They told me they mixed up dstv rewards with my monthly payments they gonna fix it they apologized. Please help me they must activate my account and do things right. I am not paying these amounts that I don't know and I don't have it.