Poor service

I'm very disappointed with the current service I’m receiving from Cartrack. I changed my account and updated them last year. They confirmed receiving my new banking details, but in December last year, they stopped debiting my monthly fee, resulting in arrears. I paid these arrears plus the December monthly fee. Starting in January this year, they again stopped debiting my account. In May, I made another arrangement to settle my account in full, and they agreed to debit from my account going forward. However, in June, they claimed I had an outstanding amount of R417.45. Despite this, they have not been providing the agreed service. I tested the service this morning, and they couldn’t track my car, yet they continue to charge my account without fulfilling their obligations.