Disgusting BAD service

I paid nearly R19 000 in September 2019 to premature cancel 2 contracts, I am still being billed for those contracts and they are still active lines. I have been speaking to a robot for 2 weeks, I fount the original mail that was sent a year ago with proof of payment attached and every time I log this claim with the retentions, I get a mail back the very next day to say it is closed. I call back to accounts and the lines are still active. Maybe I must cancel my debits and wait for them to eventually call me back for their money and I will make them run after me for a year. I am infuriated with the terrible service