Unhappy Client

I am not happy with Multi choice (DSTV) after checking the amount that was due to me and made a Payment then was told to make another Payment in order for me to re-connect. I fail to understand why I was told to pay certain amount knowing very well that it was not sufficient.

I paid what I was told to Pay and now I paid R121.00 for nothing.

I want the amount that I paid to be added on my next installment.