Worst customer service

I called Tracker in January to update my banking details with them. This has not been done and they keep on trying to debit from an account that does not exist anymore. I phoned and sent emails but still this has not been done. This is reflecting negatively on my credit record. The customer service is poor, the consultants don't know what they are doing, not a single one has been able to do a simple thing as change banking details. They hardly ever answer the phone, emails are ignored. I can only imagine the service you get after a car is ******. I do not recommend Tracker Connect to anyone.