Cartrack no response

On the 04/12/2017 I emailed cartrack to cancel my contract as I sold the vehicles that were covered on this policy, it is now the 17/05/2018 and still I am getting debited after being told that my account has been cancelled by Smangaliso Ndaba ( cartrack client services) via email, this has not been done according to Sandi Mbengashe (cartrack client services). I have a chain of mails back and forth but no one seems to be repsonding to my mail, I am giving you until the end of this week to resolve this issue as to date you have taken monthly debit orders for a service that I don't use, if i do not get a response I will be visiting the car track offices next week and then there will be a big issue.