Bad accounting (arrear) system

This platform seems to be the only one Cartrack listens to. From endless demand emails, more than 10 spam calls a day, to a WhatsApp bot, this is very reckless of cartrack and lack of respect for their clients. This is not a way to handle accounts in arrears, even worse, my account is not in arrears. Account department offered me a discount on a cancellation fee but amazingly, their agents cannot see this and they are so trigger happy to make demand calls. I have spoken to numerous agents and they confirm the credit note on their system but calls, and demand emails does not stop. I am very annoyed by this from an institution that I subscribed for almost 8-10 years. I am at the tail end of my patience with them.