Claiming service for a ghost car ,after lockdown bad service and customer relations

April 2019 ,had my car written off from an accident ,I called cartrack to cancel the vehicle tracker ,to my surprise now following the lockdown level 3 ,I started receiving calls and sms about my car from them ,and calls form collection ,claiming I need to pay 2000 in service. when I call them the lady says as long I had not received cancellation documents then ,it means my service where not terminated.this bad customer service ,1year and half later .