on dstv xtra yet u charge R860??

I called toward the end of January and requested that my account be downgraded to dstv xtra. I was told that it can only happen at the end of February. I had paid my account & this month I am being billed an amount of R860?? Why is that? Since Sunday I have been trying to get hold of the call centre. But because my account is in arrears and I refuse to pay this amount until it is clarified to me. I want it sorted out by 12 o clock today besides you are treated as if you have done something wrong as you do not have the option of even remotely speaking to the call centre.