Unsatisfied customer

I have 2 contracts with telkom mobile. one is a cell fone and another one is a router. These were all ****** on the 10th of March 2018. I reported this on the same morning of the 10th. The fone on the same day and i received ICC number but the router was not closed, I had to call telkom again and they said it can take 24 hrs to close or blacklist the router. I could only use my router number the next day in the afternoon. For the month of April R1045,93 was debited from my account. Before this I use to pay R448 (that is my monthly subscription). From May until August 2018 my monthly bill is R751.50. Now there is an extra R300 (subscriptions & once-off charges) that I pay. I told telkom that i never subscribe this and they refuse to refund those R300 of 5 months. I've tried to reason with telkom mobile but we don't reach a common understanding. I am very depressed and this is putting me out of budget. I contacted Telkom mobile on the 24th August 2018, they said this subscription was cancelled on the 4th June 2018 but on my side it was never cancelled. Telkom mobile customer service is very poor.