Charged for a month my internet was not connected

They charging me for a month my internet wasn’t on. I skipped a payment due to financial issues and when I tried paying today, I’m charged R1000 for 2 months. They switched their internet on for a hour and off again a few times in the month I didn’t pay. Now they charging a full amount as if I had daily internet connection. When I call to sort it out, all of a sudden their customer service agents can’t hear me.

Get this sorted or cancel my subscription and collect the router.