Harassment And Unauthorized debit order

WORSE Company ever, I joined cartrack December 2020,then last year January decided to cancel my contract,got a call from their consultant that I'm suppose to pay cancellation fee which is R3500 okay,then I arranged with them to debit 300 every month, since then everymonth they debit then send me harassing messages calls that they getting me arrested and handing over my account to the lawyers,I ask all the time why and how?because I have proof of you debiting my account you guys debit my account twice a day then call to harass me the unauthorized debit order and rude Consultant I Regret meeting you