Good day I would like my service to be cancelled with immediate effect

Good day I would like my service to be cancelled with immediate effect. My ID Number is as quoted above. Resonan for Termination: I believe my information and location have been compromised to a third party tracer as I have been followed and located by 2 cars in the past 2 weeks claiming to be tracers for MFC, the only way I could be tracked is through Netstar. Please revert back to me urgently with a date to uninstall my tracking device. Regards Mapula