Does not hold up to promises made

I signed on with Car track roughly 3 weeks ago. After the first week their unit kept on draining my vehicles battery and had issues in the morning to start it. I contacted them and they sent someone out to come investigate,but due to the battery being low he could not do his final test so he then suggested to disconnect the unit for a couple of days to see if there is any change and then call him back. On monday the 26/04/2021 i contacted him to advise that my battery is not being drained and the vehicle starts perfectly in the mornings, upon where he told me to still leave it for a couple more days. On Wednesday the 28/04/2021 i received a phone call from the call centre where the agent advised me that they will send the technician to come remove the faulty unit and re-install a new one. By today still no one has come out to rectify this problem and i have reversed both debit order payments as i feel why must i pay for a service and for a unit that is faulty. I have been told last week monday that the issue will be resolved within 48hours,just to only get a phone call enquiring why i reversed my payments and then was told they will send a mail to get a manager to get in contact with me by close of business to discuss how this matter will be resolved. it has now been 5 days later and still no phone call.