Terrible customer service, direct debits still being deducted, 8 months after the car has been sold.

********** customer service, the worst ever. I'll never take insurance out from Oakurst again. I had a smartbox telematics device installed in my car through Oakhurst insurance, I've sold the car last year November and transferred the device into the new owners name, however, Netstar have continued to bill me every month. I have tried numerous times to phone and resolve the situation but I get transferred to a different department every 5 minutes, no one seems to know how to assist. Extremely frustrating. They never seem to have issues starting the debit orders, but it seems impossible to end them. The 2 companies keep pointing fingers at each other instead of trying to resolve the situation.