Tracker Connect does not want me to cancel my subscription with them

Good day,

Can someone please assist. I cancelled my tracker subscription sometime in August 2019 and they even sent me Cancellation letter. They keep on calling me and debiting my account, causing me unnecessary bank charges. As I speak, the have just tried to debit my account again and have incurred some expenses. They sent me a cancellation letter, so why does their trashy system shows them that i have cancelled and they issued me a letter? Can whoever responsible pay all the fees that they caused with my bank with immediate effect! Not sure why is it an issue if someone is no longer interested in their services.