DSTV *****ing from customers

On the 17th August I was billed for the remaining days of the month which I did not have a problem with. One week later I paid another R778 on my account, thinking that i would would atleast be covered for the majority of October, instead my service is being terminated while I have a credit on my account that could have covered me for atleast 17 days of October. So why did I have to pay R778 on the 23rd August?

I guess this is multichoice way of *****ing from their customers. Can someone please investigate this