Very bad service

Hi. Kindly assist. I signed up for Dstv streaming. Then I called to cancel streaming and have dstv compact package only. I was advised by the agent that they can't cancel the streaming on their side . I need to download the app to cancel it on my side. Which I did cancel streaming last month. Then I received the notification for the payment. The amount was more than the agreed payment. The agen still said that streaming is showing as inactive. If which on my side shows the same. Now today when I check the outstanding amount for next month it is double the amount. Are you charging for streaming and why because it was cancelled? Please sort this out ASAP