Fed up with Telkom

Telkom is adding more money on my debits, claiming I have subscribed to those things.End of July I was debited R195 extra, End of August it was fine, They debited R449. This month the invoice say they will debit R711. How did I end up here. My debit order is R449 for crying out loud, this is not on. I sent email asking to cancel my contract, to date nothing happened. This is day light *******