Cartrack

Hi, my contract lapses on July 2020, I phone car Tracker that I don't want to continue anymore they kept debited to my account for 2 months and I end up reversing and block the debit still today they keep phoning me say I must pay R483 they said they will keep phoning me every day since last year September they phone with different number and i keep blocking them and they pop up with new numbers everyday i am sick and tired of this company