Multichoice is robbing me

I have a problem with multichoice Dstv I paid R1385. 33cent and that is the money they said I owe when I called to enquire about my account. After 6days they cut my connection my decoder is off and when I call they tell me I owe R502. I called and asked them why do they say I owe multichoice cause according to my knowledge when you haven't paid your subscription they cut it off. How do I owe they told me the Dstv played over by days that's why. My problem is why did they not cut my account when they see that my account is not paid like they always do. Nobody has answers for me when I call they keep on transferring from one consultant to another then they drop my calls. I am tired of calling using my own airtime and I have already paid and I don't understand why my subscription is off and I owe money.