Misterious amount

I'm so heart broken and angry at the same time. DStv has been debitting their monthly installment on compact package. All of a sudden I'm receiving a message that this month I should pay R1589. For what? I don't know, please sort your mess out I wanna be connected again my kids are suffering. Even on July I was billed R700 but I thought they made a mistake the remaining amount will fall on the following month. But not that was not the case, I was billed the normal amount the following month. So now it's November they want R1589. Please assist me, I can even send my bank statement to show that I never skipped not even a single payment. Oh I was even told that I has upgraded my package to premium on their website, by that time I don't know how to their website look like please assist me urgently. It's been 4days without watching TV.