Unhappy and Agitated Customer

I have been with Dstv for over 10yrs now, with 2 subscriptions. I have been on cash and debit payment type on the same account, where they decided to change the original debit date from 20th of each month to the 5th of each month, I mean who gets paid on the 5th. So they have been debiting my account on the 5th and they don't get enough money which causes issues on my personal account. Dstv would then disconnect my accounts post the decline of the debit and I'll always call them to ask how much must I pay. So I've been paying the last 3months after disconnection and I'll pay the money I'm told over the phone. This current month, the same thing happened and I called them after the debit declines because the other subscription was disconnected and I paid R604 for the compact, then a week after they disconnected my premium subscription and I called and I paid R970, all went well. Then after one day, they disconnected my premium saying I owe R1677. When I call in, no one can explain what is the outstanding amount for, no one who can explain. Now I'm very unhappy and I tried to cancel my subscriptions so that I can get a refund even if it's prorated it's fine, but they say I must pay the outstanding amount first, but what is is for. Please can someone assist in this regard, this is braod day ******* and their agents are ***********.